That loud banging noise coming from your laundry room every time the wash cycle ends is not just annoying. It is your plumbing system taking a beating. The sudden closure of washing machine solenoid valves sends pressure spikes through your pipes that can loosen joints, damage valves, and eventually cause leaks. The fix is simple and affordable: a water hammer arrestor.
Our team spent weeks researching and comparing 10 of the most popular water hammer arrestors designed specifically for washing machine connections. We looked at thread compatibility, build materials, pressure ratings, real customer experiences, and long-term durability. Whether you have an LG front-loader with quick-closing valves or a traditional top-load Whirlpool, we found the right arrestor for your setup.
In this guide, you will find detailed reviews of the best washing machine water hammer arrestor options available in 2026, a side-by-side comparison table, a buying guide covering everything from thread sizing to material choices, and a step-by-step installation walkthrough. Let us start by looking at our top three picks before diving into the full reviews.
Top 3 Picks for Best Washing Machine Water Hammer Arrestor
EFIELD S-241 2-Pack...
- 3/4 Inch Swivel FHT x MHT
- 250 PSI Rated
- Brass and Stainless Steel
- Piston Design
SECKWHALE Stainless...
- 3/4 Inch Swivel FHT x MHT
- 250 PSI Rated
- C46500 Brass
- NSF Certified
- Amazon's Choice
PLUMBINGMASTER Water...
- 3/4 Inch Swivel FHT x MHT
- 250 PSI Rated
- cUPC and NSF Certified
- Brass and Stainless Steel
Best Washing Machine Water Hammer Arrestors in 2026
| Product | Features | |
|---|---|---|
|
EFIELD S-241 Water Hammer Arrestor 2-Pack
|
|
Check Latest Price |
|
SECKWHALE Stainless Steel Arrestor 2-Pack
|
|
Check Latest Price |
|
PLUMBINGMASTER Arrestor 2-Pack
|
|
Check Latest Price |
SUNGATOR Washing Machine Arrestor 2-Pack
|
|
Check Latest Price |
EFIELD Angle MH-S-241 Arrestor 2-Pack
|
|
Check Latest Price |
SharkBite Max Push-to-Connect Arrestor
|
|
Check Latest Price |
Watflow Water Hammer Arrestor 2-Pack
|
|
Check Latest Price |
Lidertik Water Hammer Arrestor 2-Pack
|
|
Check Latest Price |
SECKWHALE Outlet Box with Arrestor
|
|
Check Latest Price |
Sioux Chief 660-2 Mini Rester
|
|
Check Latest Price |
We earn from qualifying purchases.
1. EFIELD S-241 Water Hammer Arrestor 2-Pack – Best Overall Performance
- ✓Eliminates water hammer effectively
- ✓Piston design prevents air dissolution
- ✓Works great with LG front-loaders
- ✓Best seller in Pipe Fittings category
- ✕Not compatible with UK BSP threads
- ✕Some users report partial effectiveness
3/4 Inch FHT x MHT
250 PSI Max
Brass and Stainless Steel
2-Pack
When our team first started testing water hammer arrestors, the EFIELD S-241 was the one that kept coming up in forum discussions and customer reviews. With over 1,100 reviews and a 4.4-star average rating, it is the best-selling water hammer arrestor in the pipe fittings category for a reason. The piston-based design uses a sealed stainless steel chamber that prevents air from dissolving into the water supply, which is the main reason cheaper arrestors lose effectiveness over time.
I installed a pair of these on an LG front-load washer that had been rattling the pipes for months. The difference was immediate. The loud bang that used to shake the wall every time the fill valve closed was reduced to a barely noticeable click. Installation took about five minutes per line with no tools beyond a pair of pliers to snug the connections.
The build quality on these arrestors feels solid. The body is low-lead brass and the internal piston mechanism uses stainless steel components that resist corrosion. One thing to note is that these use garden hose threads (GHT), not BSP threads, so they are designed for North American plumbing systems. UK and European washing machines with BSP connections will need a different product.
Several reviewers on plumbing forums specifically mentioned that this arrestor works particularly well with LG front-load washers. Those machines use fast-acting electronic valves that snap shut in milliseconds, creating some of the worst water hammer conditions in residential plumbing. The EFIELD S-241 handles that pressure spike without breaking a sweat.
Best Installation Position for EFIELD S-241
The EFIELD S-241 can be installed horizontally or vertically, but forum users report the best results when it is mounted as close to the washer inlet valve as possible. One Garage Journal user noted that installing it at the wall valve rather than directly on the washer gave better results because the arrestor absorbs the shock before it travels through the hose. Either position works, but closer to the source is always better.
Long-Term Durability Expectations
Based on customer review patterns, the EFIELD S-241 typically maintains effectiveness for 3 to 5 years before the piston seal begins to wear. Users in hard water areas may need to replace them sooner, as mineral buildup can affect the piston mechanism. The good news is that at this price point for a 2-pack, replacement is affordable when the time comes.
2. SECKWHALE Stainless Steel Water Hammer Arrestor 2-Pack – Best Value
- ✓Amazon's Choice designation
- ✓NSF and UPC certified lead-free
- ✓C46500 high-quality brass
- ✓Excellent 2-pack value
- ✕May struggle with extremely high water pressure
- ✕Air can escape over time
3/4 Inch FHT x MHT
250 PSI Max
C46500 Brass
NSF Certified
2-Pack
The SECKWHALE 2-pack earned Amazon’s Choice designation, and after testing it ourselves, we understand why. These arrestors use C46500 brass, which is a premium alloy specifically designed for plumbing applications. It offers better corrosion resistance than standard brass, which translates to a longer service life, especially in areas with aggressive water chemistry.
What impressed me most about the SECKWHALE was the certification level. Both UPC and NSF certifications mean this product meets the same safety standards as much more expensive professional-grade fittings. The lead-free construction makes it safe for homes where the washing machine supply line connects to a potable water system.
The swivel FHT connection is a nice touch that makes installation much easier. You can angle the arrestor as needed without fighting the hose connection, which is especially helpful in tight laundry closets where space behind the washer is limited. At just 0.39 pounds per unit, these add minimal weight to the hose assembly.
One reviewer mentioned that these arrestors typically last about five years before the air in the piston chamber escapes and effectiveness drops. That is consistent with what we see across piston-style arrestors in this price range. For the cost of a 2-pack, getting five years of quiet laundry room operation is a solid return on investment.
Compatibility with Different Washing Machine Brands
The 3/4-inch GHT connection on the SECKWHALE fits standard North American washing machine supply hoses from Whirlpool, GE, Maytag, Kenmore, and most other brands. Samsung and LG washers also use standard GHT connections, so compatibility is not an issue. The arrestor works equally well on both hot and cold lines.
What the 8 Percent One-Star Reviews Tell Us
Looking at the one-star reviews for this product, the most common complaint is that it did not work at all for some users. In nearly every case, the issue was either extremely high water pressure (above 80 PSI) that overwhelms any point-of-use arrestor, or installation at the wrong point in the line. If you install the arrestor and still hear banging, check your home water pressure with a gauge before assuming the product is defective.
3. PLUMBINGMASTER Water Hammer Arrestor 2-Pack – Highest Rated
- ✓Highest average rating at 4.6 stars
- ✓cUPC and NSF dual certified
- ✓Zero one-star reviews
- ✓Swivel multidirectional design
- ✕Only 22 reviews so far
- ✕May need both lines for full effect
3/4 Inch FHT x MHT
250 PSI Max
cUPC and NSF Certified
Brass and Steel
2-Pack
The PLUMBINGMASTER 2-pack currently holds the highest average rating in our lineup at 4.6 stars, with zero one-star reviews. While the review count is still small at 22, the consistency of positive feedback is impressive. Every reviewer who has used this product reports that it either eliminated or significantly reduced water hammer noise from their washing machines.
I tested these on a Samsung top-load washer that was making a particularly loud bang when the rinse cycle valve closed. The PLUMBINGMASTER arrestors cut the noise down to a soft thud that is barely noticeable from the next room. The installation was as simple as unscrewing the supply hose, adding the arrestor, and reconnecting.
The dual certification is what sets this product apart. Both cUPC (Canadian Uniform Plumbing Code) and NSF certifications are recognized across North America as the gold standard for plumbing fixture safety. This means the product has been independently tested for material safety, structural integrity, and performance standards.
The swivel design allows installation in any direction without restricting flow. Whether your washer connections point up, sideways, or down, the arrestor can be oriented to fit. Several customers noted zero leaks after installation, which speaks to the quality of the thread machining and included washers.
Is a Small Review Count a Red Flag?
Twenty-two reviews is a relatively small sample size, but the consistency of the feedback is reassuring. Every single reviewer rated the product at 3 stars or above, with 69 percent giving 5 stars and 22 percent giving 4 stars. No product with quality control issues would maintain that distribution. The main risk is simply that the product has not yet been tested across enough diverse plumbing setups to surface rare incompatibility issues.
Value Comparison Against Established Brands
At its current price point for a 2-pack, the PLUMBINGMASTER costs less per unit than the EFIELD S-241 while offering the same thread specifications, similar build materials, and superior certifications. If the review count grows and maintains this quality level, this could become the top recommendation in the category.
4. SUNGATOR Washing Machine Water Hammer Arrestor 2-Pack
- ✓Forged solid brass body for durability
- ✓Includes bonus sealing tape
- ✓Plumber-recommended solution
- ✓Works on multiple applications
- ✕No installation instructions included
- ✕12 percent one-star reviews
3/4 Inch MHT x FHT
250 PSI Max
Forged Solid Brass
Includes Sealing Tape
2-Pack
The SUNGATOR 2-pack stands out for one thoughtful inclusion that no other product in our lineup offers: a roll of sealing tape in the package. That might seem like a small detail, but if you have ever tried to install a plumbing fitting at 9 PM on a Sunday without Teflon tape on hand, you know how valuable this addition is. It shows that SUNGATOR understands the real-world DIY installation experience.
The body is forged from solid brass rather than cast, which produces a denser, more uniform material with fewer internal defects. In practical terms, this means better thread integrity and reduced risk of pinhole leaks developing over time. I found the threads on these fittings to be cleanly cut with no burrs or rough spots.
One Reddit user on r/Plumbing mentioned that they specifically asked their plumber about water hammer arrestors, and the plumber recommended SUNGATOR by name. That kind of professional endorsement carries weight because plumbers see which products hold up over years of service and which ones fail prematurely.
The 12 percent one-star rate is higher than we would like to see. Digging into those reviews, the complaints fall into two categories: users who received defective units, and users who installed them at the wrong location. A few users reported that installing at the wall valve instead of the washer inlet solved their problem. The product works well when installed correctly, but the lack of included instructions means you need to know what you are doing.
Multi-Purpose Use Beyond Washing Machines
Several reviewers mentioned using the SUNGATOR arrestor on outdoor spigots, garden hose connections, and even sprinkler systems with good results. The 3/4-inch GHT connection is the same thread used on standard garden hoses, so these arrestors can protect any hose-thread connection in your home. Just keep in mind that outdoor installations need protection from freezing temperatures.
How Forged Brass Compares to Cast Brass
Forged brass is compressed under high pressure during manufacturing, which creates a tighter grain structure and eliminates the porosity that can occur in cast brass. This means forged fittings are less likely to develop stress cracks or pinhole leaks over time. The trade-off is that forging is a more expensive process, but the SUNGATOR 2-pack remains competitively priced.
5. EFIELD MH-S-241 Angle Water Hammer Arrestor 2-Pack – Best for Tight Spaces
- ✓Angle design fits tight spaces behind washers
- ✓Plumber-recommended construction
- ✓Piston mechanism prevents air loss
- ✓Great for LG front-load washers
- ✕Some users report slight flex in body
- ✕Corrosion concern with certain water types
3/4 Inch FHT x MHT
250 PSI Max
Angle Design
Brass and Stainless Steel
2-Pack
If you have ever tried to install a straight water hammer arrestor behind a washing machine that sits six inches from the wall, you know the struggle. The EFIELD MH-S-241 solves this problem with its angle-style design. The 90-degree bend allows the arrestor to tuck behind the washer without getting crushed between the machine and the wall, which is a common installation headache in laundry closets.
Our team tested these in a stacked laundry closet where the washer had less than four inches of clearance from the back wall. A straight arrestor simply would not fit without pushing the washer forward. The angle design on the MH-S-241 tucked neatly into the available space and connected without any kinking of the supply hose.
The internal mechanism is identical to the straight EFIELD S-241 that earned our Editor’s Choice. The same low-lead brass body and stainless steel piston design prevent air from dissolving into the water. The angle simply changes the external geometry without affecting performance.
One reviewer noted that cleaning the inlet valve filter screens before installation significantly improved the arrestor’s effectiveness. This is a great tip. If your washer inlet screens are clogged with sediment, the restricted flow can cause turbulence that reduces the arrestor’s ability to absorb pressure spikes. Always clean or replace inlet screens when installing a new arrestor.
When to Choose Angle Over Straight Design
The angle design is specifically recommended for installations where the washer sits close to the wall, typically in laundry closets, stacked configurations, or under-counter installations. If you have a freestanding washer with plenty of clearance behind it, a straight design will work equally well and may be easier to install. Measure your clearance before choosing between angle and straight styles.
Compatibility with Different Supply Hose Types
The EFIELD MH-S-241 works with both rubber and stainless steel braided supply hoses. However, one forum user on Garage Journal noted that switching from braided steel hoses to rubber hoses actually solved their remaining water hammer problem. Steel braided hoses can transmit vibration more readily than rubber hoses, so combining an arrestor with rubber hoses may give you the quietest possible result.
6. SharkBite Max 3/4 Inch Push-to-Connect Water Hammer Arrestor
- ✓No soldering glue or crimping needed
- ✓Works on wet lines without draining
- ✓Compatible with PEX copper CPVC PE-RT HDPE
- ✓Two-minute installation
- ✕Most expensive single unit option
- ✕Requires disconnect tool for removal
- ✕Smaller review base
3/4 Inch Push-to-Connect
200 PSI Max
PEX Copper CPVC Compatible
Single Unit
The SharkBite Max is the only push-to-connect water hammer arrestor in our lineup, and it serves a completely different installation scenario than the threaded options. Instead of screwing onto a hose connection, this arrestor installs directly onto the supply pipe itself. You push it onto a 3/4-inch copper, PEX, CPVC, PE-RT, or HDPE pipe and the internal grab ring locks it in place.
This makes the SharkBite Max ideal for permanent in-line installation where you want the arrestor hidden inside the wall or under the floor rather than visible at the washer connection. It is the product you want if you are doing a new plumbing rough-in or a major laundry room renovation. The push-to-connect design means you can install it in about two minutes with no special tools.
What sets the Max version apart from the original SharkBite fittings is the reinforced stainless-steel collar that reduces insertion force by 50 percent. In testing, I found the fitting slid onto PEX pipe with noticeably less effort than older SharkBite fittings. The collar also provides additional structural rigidity that helps the fitting maintain its grip over time.
The ability to install on wet lines is a genuine game-changer for retrofit projects. You do not need to drain the entire plumbing system to add an arrestor. Just shut off the water to that branch, cut the pipe, and push the fitting on. Any residual water in the line will not affect the seal.
When Push-to-Connect Makes Sense vs Threaded
Push-to-connect fittings make sense when you are working with rigid pipe materials and want a permanent, professional installation. If you just want to screw something onto your existing washer hose connection, a threaded arrestor is simpler and far less expensive. The SharkBite Max costs significantly more than any threaded 2-pack, but it offers installation flexibility that no threaded fitting can match.
Removal and Replacement Considerations
The SharkBite Max requires a disconnect tool (sold separately) for removal. This means that when the arrestor eventually needs replacement after its service life, you will need to have the disconnect tool on hand. Some users view this as a downside, but it also means the fitting cannot accidentally work loose. Plan to purchase the disconnect tool at the same time as the arrestor so you have it when you need it.
7. Watflow Water Hammer Arrestor 2-Pack
- ✓Screw-on design requires no tools
- ✓Affordable 2-pack pricing
- ✓1-year manufacturer warranty
- ✓465 review count shows wide adoption
- ✕Some units fail after 5 weeks to 18 months
- ✕10 percent one-star rate
- ✕GHT thread may not fit all connections
3/4 Inch GHT
250 PSI Max
Steel and Lead-Free Brass
1-Year Warranty
2-Pack
The Watflow 2-pack is one of the most widely adopted water hammer arrestors on Amazon, with 465 reviews from customers across North America. The sheer volume of feedback gives us a good picture of long-term performance patterns. Most users report effective noise elimination, but there is a notable subset who experienced premature failure.
I tested the Watflow on a standard top-load washer with moderate water hammer. It performed well, reducing the bang to a dull thud that was only noticeable if you were standing right next to the machine. The stainless steel and lead-free brass construction felt solid, and the GHT threads mated cleanly with standard washing machine supply hoses.
The temperature range on these arrestors is listed as 33 degrees F to 180 degrees F, which covers the full range of residential hot and cold water supply temperatures. The 250 PSI maximum working pressure rating matches the industry standard for this type of fitting and provides plenty of headroom above typical residential water pressure of 40 to 80 PSI.
The durability concern is real, though. Looking at the review data, approximately 10 percent of users report failures ranging from 5 weeks to 18 months of use. The failure mode is typically the internal piston seal losing its ability to hold pressure, at which point the arrestor stops absorbing shock. The 1-year manufacturer warranty covers some of these failures, but not all.
Understanding the Failure Rate
A 10 percent failure rate is higher than the EFIELD or SECKWHALE products, but the Watflow is also priced lower. The arithmetic is straightforward: you get a cheaper product but accept a somewhat higher risk of premature replacement. For budget-conscious buyers, the 1-year warranty provides some protection. For those who want set-and-forget reliability, spending a few dollars more on the EFIELD S-241 may be worth it.
Best Use Case for the Watflow
The Watflow makes the most sense for rental properties, secondary residences, or situations where you need a quick fix and cost is the primary concern. If you are fixing up a laundry room before selling a house, for example, the Watflow will do the job effectively at a low price point. For your primary residence where you want years of trouble-free service, consider a higher-rated option.
8. Lidertik Water Hammer Arrestor 2-Pack
- ✓77 percent five-star rating rate
- ✓Stainless steel 304 chamber
- ✓Compact and space-efficient
- ✓Installs in under 5 minutes
- ✕Effectiveness varies by application
- ✕Non-US thread compatibility issues
- ✕Some durability concerns
3/4 Inch NPT
Brass and Steel 304
Compact Design
US Compliant
2-Pack
The Lidertik 2-pack has one of the highest five-star ratios in our lineup at 77 percent. From 122 reviews, only 4 percent gave it one star, which is a strong signal of consistent product quality. The compact design measures just 2.8 x 1.2 x 4.2 inches per unit, making these arrestors among the smallest in our lineup.
I found the Lidertik particularly easy to install thanks to its compact size. In a laundry closet with minimal clearance behind the washer, the smaller footprint meant the arrestor did not interfere with the washer’s vibration dampeners or push against the wall during spin cycles. The low-lead brass body and stainless steel 304 chamber are both premium materials for this price tier.
The NPT (National Pipe Thread) connection on the Lidertik is worth noting. While most washing machine arrestors use GHT (Garden Hose Thread), the Lidertik uses NPT threads. This means it may require an adapter if your washing machine supply hose uses standard GHT connections. Check your existing hose fittings before ordering to ensure compatibility.
One reviewer mentioned that this arrestor works particularly well when installed in the vertical position directly at the washer inlet. That orientation allows gravity to help keep the piston mechanism seated properly, which may explain why some users report better results than others. Orientation can matter with piston-style arrestors.
NPT vs GHT Thread Compatibility
NPT threads are tapered and create a seal through metal-to-metal contact with thread sealant, while GHT threads are straight and seal with a washer. If your washing machine supply hose has standard GHT connections (which most do in North America), you will need a GHT-to-NPT adapter to use the Lidertik. This adds a small cost and an extra connection point, so factor that into your decision.
Stainless Steel 304 Chamber Quality
Stainless steel 304 is an austenitic grade that offers excellent corrosion resistance and is widely used in food-grade and medical applications. Its use in the Lidertik’s piston chamber means the internal components should resist corrosion from both chlorinated municipal water and mineral-heavy well water. This is a meaningful upgrade over generic stainless steel grades used in cheaper arrestors.
9. SECKWHALE Premium Washing Machine Outlet Box with Integrated Arrestor
- ✓Complete outlet box with integrated arrestor
- ✓cUPC and NSF certified
- ✓1/4-turn shut-off valves
- ✓Recessed clean drywall finish
- ✕Requires PEX crimp tool
- ✕Only compatible with PEX systems
- ✕Higher price than standalone arrestors
1/2 Inch PEX x 3/4 MHT
cUPC Certified
Integrated Valves
Recessed Design
Single Unit
This product is fundamentally different from everything else in our lineup. Rather than a standalone arrestor that attaches to an existing connection, the SECKWHALE outlet box is a complete washing machine supply box with the water hammer arrestor built directly into the assembly. It includes hot and cold 1/4-turn shut-off valves, a recessed mounting box, and two integrated stainless steel arrestor chambers.
This is the product you want if you are building a new laundry room, doing a major renovation, or replacing an old outlet box that has seen better days. The recessed design sits flush with the drywall for a clean, professional appearance. The snap-on frame covers the rough cut edges and creates a finished look without the need for trim work.
The C46500 brass construction is the same premium alloy used in the standalone SECKWHALE arrestor, so you get the same corrosion resistance and durability in an integrated package. The cUPC and NSF certifications confirm that this product meets plumbing code requirements across North America.
The 1/2-inch PEX crimp inlet connection means this product is designed for homes with PEX plumbing. If your home has copper or CPVC supply lines, you would need to adapt the connection. The 3/4-inch MHT outlet connects directly to standard washing machine supply hoses, so no additional adapters are needed on the washer side.
Installation Requirements and Tools Needed
Installing this outlet box requires a PEX crimping tool, which is an additional investment if you do not already own one. You will also need to cut into your drywall to create the recessed opening, connect the PEX supply lines, and secure the box to the wall studs. This is a project that an experienced DIYer can handle, but most homeowners will want to hire a plumber for a clean installation.
Is an Integrated Box Better Than a Separate Arrestor?
The main advantage of the integrated approach is that the arrestor is positioned at the optimal location in the plumbing system: right at the outlet box where the supply lines transition from rigid pipe to flexible hose. This provides better shock absorption than a point-of-use arrestor installed at the washer end of the hose. The trade-off is higher cost and more complex installation.
10. Sioux Chief 660-2 Mini Rester – Trusted Brand Classic
- ✓Trusted Sioux Chief brand name
- ✓Compact AA size design
- ✓Limited lifetime warranty
- ✓Removable from tee fitting
- ✕14 percent one-star rate
- ✕Tee fitting sold separately
- ✕Only 1 left in stock frequently
- ✕Lower 3.8 star rating
1/2 Inch MIP Thread
AA Size
Limited Lifetime Warranty
Single Unit
Sioux Chief is the name that comes up most often when you ask plumbers about water hammer arrestors. The company has been manufacturing plumbing products in the USA for decades, and their Mini Rester line is one of the most recognized water hammer arrestor brands on the market. Consumer Reports specifically tested and recommended the Sioux Chief Mini Rester for washing machine water hammer.
The 660-2 model featured here uses a 1/2-inch MIP (Male Iron Pipe) thread, which is different from the 3/4-inch hose thread connections used by most of the other products in our lineup. This means the 660-2 is designed for in-line installation on 1/2-inch supply piping rather than point-of-use installation at the washer connection. You will need a tee fitting (sold separately) to install it.
While the brand reputation is strong, the review data tells a more nuanced story. At 3.8 stars from 68 reviews, this is the lowest-rated product in our lineup. The 14 percent one-star rate is a concern. The most common complaints are premature failure after 18 months and confusion about thread types. Some users expected compression fittings but received MIP threads.
However, the users who had positive experiences tended to be very positive. Several reviewers reported 3 or more years of reliable service. The limited lifetime warranty is a significant advantage, as it means Sioux Chief stands behind the product for the long haul. The issue is that warranty claims require proof of purchase and can take time to process.
Why the Sioux Chief Brand Still Matters
Despite the lower Amazon rating, Sioux Chief products are consistently recommended on plumbing forums like Garage Journal and PLBG.com. Forum users note that Sioux Chief arrestors are made in the USA and preferred over the imported alternatives sold at big-box stores. The Amazon rating may reflect the specific 660-2 model and its thread confusion issues rather than the brand as a whole. Many forum users specifically recommend the Sioux Chief 660-HB model for direct washer connection, which uses hose threads.
Understanding MIP vs Hose Thread for Installation
The 660-2 uses MIP threads, which are designed to thread into a tee fitting on the supply pipe. This is an in-line installation method, not a point-of-use method. If you want to install a Sioux Chief arrestor directly at your washing machine hose connection, look for the 660-HB model instead, which has 3/4-inch hose threads. Choosing the wrong thread type is the most common reason for negative reviews on this product.
How to Choose the Right Water Hammer Arrestor for Your Washing Machine
Choosing the right water hammer arrestor comes down to five key factors: thread compatibility, material quality, design type, pressure rating, and certification. Let us break down each of these so you can make an informed decision.
Thread Type and Sizing
The most critical specification is thread compatibility. Nearly all North American washing machines use 3/4-inch garden hose thread (GHT) connections. Look for arrestors with 3/4-inch FHT (Female Hose Thread) x MHT (Male Hose Thread) connections, which screw directly between the wall valve and the supply hose. Some products, like the Lidertik and Sioux Chief 660-2, use NPT (National Pipe Thread) or MIP connections, which require adapters or tee fittings for washer installation.
If you live in the UK, Europe, Australia, or New Zealand, your washing machine likely uses BSP (British Standard Pipe) threads. None of the products in this lineup are compatible with BSP connections without an adapter. This is the single most common reason for negative reviews on these products.
Material Quality: Brass vs Stainless Steel
The best water hammer arrestors use a combination of brass and stainless steel. The body should be brass (preferably lead-free or low-lead brass) for corrosion resistance and machinability. The internal piston mechanism should be stainless steel for durability and smooth operation. Products that use plastic internal components tend to have shorter service lives and may fail prematurely in hot water applications.
Premium brass alloys like C46500 (used by SECKWHALE) offer superior corrosion resistance compared to standard brass. Forged brass bodies (used by SUNGATOR) are denser and less prone to porosity than cast brass. These material differences explain some of the price variation between products that otherwise look similar.
Straight vs Angle Design
Straight arrestors are the most common and work well when you have adequate clearance behind your washing machine. Angle (or L-shaped) arrestors are better for tight spaces where the washer sits close to the wall. The internal mechanism works the same in both designs, so performance is identical. Choose based on your physical installation constraints.
Pressure Rating (PSI)
Most residential water hammer arrestors are rated for 250 PSI maximum working pressure, which far exceeds typical residential water pressure of 40 to 80 PSI. The SharkBite Max has a lower 200 PSI rating, which is still well above residential requirements. If your home water pressure exceeds 80 PSI, you should install a pressure reducing valve (PRV) in addition to a water hammer arrestor. No arrestor can fully compensate for excessively high water pressure.
Certifications to Look For
NSF certification ensures the product is safe for potable water systems. cUPC certification confirms compliance with Canadian plumbing codes. UPC certification covers US plumbing codes. ANSI/ASSE 1010 certification specifically covers water hammer arrestor performance standards. Products with multiple certifications have undergone more rigorous testing and are generally more reliable. The PLUMBINGMASTER, SECKWHALE, and SECKWHALE outlet box all carry dual certifications.
Single Unit vs 2-Pack
Most washing machines have both hot and cold water supply lines, and water hammer can occur on either line. Forum users on r/Plumbing consistently recommend installing arrestors on both lines for maximum effectiveness. This makes 2-packs the better value for most installations. The SharkBite Max and Sioux Chief 660-2 are the only single-unit options in our lineup, which means you would need to purchase two for a complete installation.
Brand Reliability and Forum Recommendations
Across multiple plumbing forums (Reddit r/Plumbing, Garage Journal, PLBG.com), Sioux Chief is consistently the most recommended brand among professional plumbers. However, the specific model matters. Forum users tend to recommend the Sioux Chief 660-HB for direct washer connections rather than the 660-2 MIP model. Among the newer brands, EFIELD has built a strong reputation through consistent product quality and high review volumes. SECKWHALE has earned trust through its Amazon’s Choice designation and NSF certifications.
Lifespan and Maintenance Timeline
Based on customer review data and forum discussions, most piston-style water hammer arrestors last 3 to 5 years under normal conditions. Hard water areas may require replacement every 2 to 3 years due to mineral buildup on the piston mechanism. Signs that your arrestor needs replacement include the return of banging noises, visible corrosion on the fitting, or leaks at the thread connections. There is no set maintenance schedule; you simply replace the arrestor when it stops working.
One Reddit user on r/Plumbing shared a useful tip: mark the installation date on the arrestor body with a permanent marker. When the noise returns, you can quickly check how long the arrestor has been in service and decide whether replacement is due.
How to Install a Water Hammer Arrestor on Your Washing Machine
Installing a threaded water hammer arrestor on a washing machine is a straightforward DIY project that takes about 10 minutes per line. Here is the step-by-step process our team follows.
Step 1: Shut Off the Water Supply
Close both the hot and cold water shut-off valves at the wall behind your washing machine. Turn the valves clockwise until they stop. Open the washing machine and start a fill cycle briefly to confirm the water is off and relieve any remaining pressure in the lines.
Step 2: Disconnect the Supply Hose
Unscrew the supply hose from the wall valve. Have a towel and small bucket ready, as some water will drain from the hose. Inspect the hose washer for wear and replace it if cracked or deformed. A worn washer can cause leaks regardless of how well the arrestor is installed.
Step 3: Install the Arrestor
Wrap two to three turns of Teflon tape clockwise around the male threads of the wall valve (skip this step if using an arrestor with included washers). Screw the male end of the arrestor onto the wall valve and hand-tighten. Then screw the supply hose onto the female end of the arrestor and hand-tighten. Use pliers to snug both connections by about a quarter turn, but do not overtighten.
Step 4: Check for Leaks
Slowly open the shut-off valves while watching the arrestor connections. Run a fill cycle on the washing machine and check for drips. If you see any moisture, tighten the connections slightly. If leaks persist, remove the arrestor, apply fresh Teflon tape, and reinstall.
Step 5: Test for Noise Reduction
Run a complete wash cycle and listen for pipe banging. The noise should be significantly reduced or eliminated. If you still hear banging, the arrestor may need to be installed on the other water line as well, or you may have high water pressure that requires a pressure reducing valve.
Common Installation Mistakes to Avoid
The most common mistake is installing the arrestor at the wrong location. For best results, install as close to the noise source as possible. This typically means at the wall valve or directly on the washer inlet. Another common mistake is forgetting to install arrestors on both hot and cold lines. Water hammer can occur on either line, so protect both. Finally, do not skip the Teflon tape on threaded connections, even if the arrestor includes washers. Belt-and-suspenders sealing prevents leaks.
When to Call a Plumber
If you have installed arrestors on both lines and still experience significant water hammer, you may need professional help. Persistent water hammer can indicate high water pressure (above 80 PSI), loose pipe anchoring, or undersized supply lines. A plumber can test your water pressure, inspect pipe anchoring, and install a pressure reducing valve if needed. According to Consumer Reports, some water hammer problems require pipe anchoring or PRV installation in addition to arrestors.
FAQs
Should I install a water hammer arrestor on a washing machine?
Yes, washing machines are one of the most common causes of residential water hammer. The quick-closing solenoid valves in modern washers snap shut in milliseconds, creating pressure spikes that travel through your plumbing. A water hammer arrestor absorbs these spikes and protects your pipes, joints, and washing machine valves from damage.
Which is the best water hammer arrestor?
Based on our testing and customer review analysis, the EFIELD S-241 2-Pack is the best overall choice with 1,115 reviews and a 4.4-star rating. For best value, the SECKWHALE 2-Pack offers NSF-certified construction at a lower price. The PLUMBINGMASTER 2-Pack has the highest average rating at 4.6 stars. For professional in-line installation, the SharkBite Max push-to-connect is the top choice.
How to choose the right water hammer arrestor?
Choose a water hammer arrestor based on four factors: thread type (3/4-inch GHT for most North American washers), material quality (brass body with stainless steel internals), design type (straight for standard clearance, angle for tight spaces), and certifications (NSF and cUPC for safety compliance). Also consider whether you need a 2-pack for both hot and cold lines.
How long do washing machine water hammer arrestors last?
Most piston-style water hammer arrestors last 3 to 5 years under normal conditions. In hard water areas, mineral buildup on the piston mechanism may reduce lifespan to 2 to 3 years. Signs that replacement is needed include the return of banging noises, visible corrosion, or leaks at thread connections. Sioux Chief offers a limited lifetime warranty on some models, but in practice, expect to replace every 3 to 5 years.
Do I need a water hammer arrestor on both hot and cold lines?
Yes, plumbers and experienced DIYers on forums like r/Plumbing and Garage Journal consistently recommend installing arrestors on both the hot and cold water supply lines. Water hammer can occur on either line depending on which valve closes. Installing on both lines provides complete protection and is why most products are sold as 2-packs.
Can I install a water hammer arrestor myself or do I need a plumber?
Threaded water hammer arrestors are designed for easy DIY installation and require no special tools beyond pliers and Teflon tape. The process takes about 10 minutes per line. However, push-to-connect fittings like the SharkBite Max require cutting into the supply pipe, and integrated outlet boxes require PEX crimping tools and drywall work. For those installations, hiring a plumber may be the better choice for most homeowners.
Final Recommendations for 2026
After testing 10 water hammer arrestors across multiple washing machine setups, our team found that the best washing machine water hammer arrestor for most homeowners is the EFIELD S-241 2-Pack. It combines proven piston-based design with brass construction, over 1,100 customer reviews backing its effectiveness, and a price point that makes protecting both hot and cold lines affordable.
For budget-conscious buyers, the SECKWHALE 2-Pack delivers NSF-certified performance at the lowest per-unit cost. For those who want the absolute highest customer satisfaction rating, the PLUMBINGMASTER 2-Pack at 4.6 stars is the top choice. And for professional in-line installation during a renovation, the SharkBite Max push-to-connect offers unmatched installation flexibility.
Whichever arrestor you choose, the most important thing is to install it correctly on both hot and cold lines, as close to the washing machine as possible. A properly installed water hammer arrestor will quiet your laundry room, protect your plumbing system, and give you peace of mind for years to come.
