5 Best Water Hammer Arrestors (2026) — Expert Reviews

Please note: Product availability and information are based on our research at time of writing and are subject to change. Always check Amazon for the latest details before purchasing.

Introduction

Water hammer is that sharp bang or thud you hear when a washing machine cycle ends, a dishwasher finishes filling, or any solenoid valve closes quickly in the supply line — the noise is a pressure wave moving through the pipe when flow stops abruptly. Left unaddressed, the repeated shock can loosen pipe fittings and accelerate wear on valve seats over time. An arrestor absorbs that shock at the source, and this roundup covers five solid options: two EFIELD arrestors covering straight and angle washing machine connections, a budget-friendly SECKWHALE straight unit, a SUNGATOR straight arrestor bundled with sealing tape, and a SECKWHALE tee-style arrestor built for under-sink fixtures.

The single most important variable is connection type, not brand: washing machine arrestors use a 3/4 inch swivel hose thread (FHT x MHT) that connects directly between the supply valve and the machine hose, while under-sink arrestors for dishwashers, faucets, and toilets use a 3/8 inch compression tee fitting that installs inline with the existing supply stub. These styles are not interchangeable — matching the right connection type before ordering is the step most likely to cause a return in this category. If you’re dealing with a pressure issue rather than a water hammer problem specifically, our comparison of a pressure reducing valve vs water hammer arrestor covers when each solution is appropriate.

Quick Comparison Table

Here’s how all five arrestors compare on connection type, configuration, and price before we go product by product.

Full Reviews — 5 Best Water Hammer Arrestors

1. EFIELD S-241 Stainless Steel Water Hammer Arrestor (2-Pack), Straight, 3/4″ Swivel FHT x MHT — Best Overall

🏆 Best Overall

Straight, Stainless Steel, 3/4″ Swivel FHT

The EFIELD S-241 earns best overall for a standard washing machine installation on the strength of its build. The stainless steel construction is the core practical advantage — it handles the thermal cycling and moisture exposure of a supply line connection without developing the corrosion that lower-grade materials can show over time, and the swivel FHT fitting lets the arrestor thread into position without twisting the connected hose, which matters at the back of a washing machine where working space is tight.

The 2-pack format is the right call for this application, since a washing machine has two supply connections — hot and cold — and protecting only one leaves the other still exposed to hammer. With stainless steel construction across both units and a swivel fitting that hand-tightens into position, this is the kind of dependable, no-surprises pick most homeowners should start with.

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2. SECKWHALE Stainless Steel Water Hammer Arrestor for Washing Machine (2-Pack), Straight, 3/4″ Swivel FHT x MHT — Top Pick

🎯 Top Pick

Straight, Stainless Steel, 3/4″ Swivel FHT

The SECKWHALE Straight is our top pick for homeowners who want the same core connection type as the EFIELD S-241 at a more accessible price. It’s the same 3/4 inch swivel FHT x MHT fitting covering the standard washing machine hose thread, built from stainless steel that matches the durability of the pricier alternative, so there’s no meaningful step down in build quality to get to the lower price point.

Like the S-241, this is a straight-configuration unit, so it’s appropriate wherever the installation has enough clearance behind the machine for the arrestor body to project outward. If you’re working in a laundry closet with the supply valves close to the back wall, check the clearance before ordering and consider the angle configuration covered next instead.

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3. EFIELD MH-S-241 Angle Stainless Steel Water Hammer Arrestor (2-Pack), 3/4″ Swivel FHT x MHT — Best for Tight Spaces

⭐ Best for Tight Spaces

Angle Configuration, 3/4″ Swivel FHT

The EFIELD MH-S-241 exists to solve a specific problem: washing machine installations where a straight arrestor physically can’t fit because the supply valve sits too close to a wall, cabinet panel, or pipe run for a straight-projecting fitting to clear. The angle geometry runs the arrestor body parallel to the wall surface rather than projecting straight outward, resolving the clearance issue without requiring you to reposition the supply valve.

Everything else matches what the straight S-241 delivers: stainless steel construction, the same 3/4 inch swivel FHT x MHT fitting, and a 2-pack covering both hot and cold supply lines in a single order. The modest price premium over an equivalent straight unit is simply the cost of the angle geometry, and for installations that genuinely need it, there isn’t a practical workaround.

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4. SUNGATOR Washing Machine Water Hammer Arrestor (2-Pack with Sealing Tape), Straight, 3/4″ MHT x Swivel FHT — Best Value

💰 Best Value

Includes Sealing Tape

The SUNGATOR earns best value for a practical reason: it includes Teflon sealing tape in the box, which removes a separate trip to the hardware store from the installation process. Plumber’s tape is required for a leak-proof threaded connection and is one of those supplies many homeowners don’t already have on hand, so finding out you need it mid-installation adds unnecessary friction to what should be a quick job.

Stainless steel construction matches the durability of the other picks in this roundup, and the 3/4 inch MHT x Swivel FHT connection covers the standard washing machine supply thread. The 2-pack format covers both hot and cold lines in a single order. As with any straight arrestor, confirm you have adequate clearance in front of the supply valves before ordering — check the angle option above if space is tight against the back wall.

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5. SECKWHALE Tee Stainless Steel Water Hammer Arrestor (2-Pack), 3/8″ x 3/8″ Compression Connection — Best for Under-Sink Fixtures

👷 Best for Under-Sink Fixtures

Tee, 3/8″ Compression

The SECKWHALE Tee is the only unit in this roundup built for under-sink fixture connections — dishwashers, faucets, toilets, and bathroom sinks — where the supply line uses a 3/8 inch compression fitting rather than the 3/4 inch hose thread of washing machine connections. The tee-style design installs inline with the existing compression fitting: the supply hose reconnects to one outlet of the tee, and the arrestor chamber occupies the branch port, with only a wrench needed to snug the fittings.

Covering four fixture types — dishwasher, sink, toilet, and faucet — from a single product is the key advantage here. If you’re not sure which under-sink fixture is generating the hammer, installing one at the main supply stub addresses the problem at the source. This unit won’t fit a 3/4 inch washing machine hose connection — the two sizes serve different jobs and aren’t interchangeable.

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Buying Guide — Choosing the Right Water Hammer Arrestor

What Causes Water Hammer, and How an Arrestor Fixes It

Water hammer happens when a fast-closing valve — a washing machine or dishwasher solenoid, a toilet fill valve, a quick-closing faucet — stops water flow abruptly, sending a pressure wave back through the pipe that you hear as a bang in the wall. Over time, that repeated shock can loosen fittings and stress valve seats. An arrestor is a small sealed chamber, typically a gas-charged piston, installed near the valve to absorb that spike before it travels further through the plumbing.

Straight vs Angle vs Tee — Matching Configuration to Your Installation

Straight arrestors are the standard for washing machine connections and work wherever the machine sits far enough from the wall to let the arrestor project outward without obstruction. Angle arrestors solve the same job but run parallel to the wall instead, for installations where a straight unit would hit a wall, cabinet, or pipe run before threading on fully — less than three or four inches of clearance behind the valve usually means angle is the safer bet. Tee-style arrestors are a different category entirely, built for under-sink fixtures like dishwashers, faucets, and toilets rather than washing machines — they install inline with the existing compression fitting and use a smaller size to match those fixtures’ narrower supply lines.

Fitting Size — 3/4″ Washing Machine vs 3/8″ Fixture Lines

Fitting size is the other non-negotiable spec. Washing machine arrestors use a 3/4 inch swivel FHT x MHT hose thread, matching nearly every US washing machine installation. Under-sink fixtures instead run on a narrower 3/8 inch compression line, which is why the tee-style arrestor in this roundup is sized differently. There’s no adapter that reliably bridges the two standards, so confirm which fitting your installation uses before ordering.

When a Pressure Fix Might Be the Better First Step

If hammer persists across multiple fixtures rather than one specific valve, elevated supply pressure may be the cause rather than something an arrestor alone resolves. Our water pressure gauges roundup can confirm whether incoming pressure is running high, and our pressure reducing valve vs water hammer arrestor comparison covers when each fix applies — our pressure regulator valves roundup covers options if a regulator is the answer. Low pressure at one fixture is a separate issue; our how to fix low water pressure in shower guide covers that instead.

Frequently Asked Questions

Q: Do I need one arrestor or one per fixture?

It depends on where the hammer occurs. A washing machine has two supply connections — hot and cold — and either can generate hammer, which is why the 2-pack washing machine units here protect both lines in one purchase. For under-sink fixtures, each one generating hammer needs its own arrestor. Most homeowners start with the loudest fixture and reassess before adding more.

Q: Can I install a water hammer arrestor myself?

Yes — it’s one of the more accessible DIY plumbing tasks, requiring only a wrench and Teflon tape. For washing machine connections: shut off the hot and cold valves, disconnect the hoses, tape the valve threads, thread the arrestors on and snug with a wrench, then reconnect the hoses. For under-sink tee arrestors: shut off the supply valve, disconnect at the compression fitting, install the tee inline, and reconnect. No pipe cutting or soldering is needed either way, and the job typically takes under 20 minutes per connection.

Q: What’s the difference between straight and angle arrestors?

Straight and angle arrestors use the same internal mechanism to absorb a pressure spike — the difference is purely in the physical geometry of the fitting body. A straight arrestor projects outward in line with the valve, while an angle arrestor bends so the body runs parallel to the wall instead. Both provide the same protection; the angle design exists solely for installations where a straight arrestor would hit a wall or cabinet before it could be fully threaded on.

Q: The banging noise came back after I installed an arrestor — what happened?

A few things are worth checking. Confirm the arrestor was installed on the correct line — if hammer is coming from the cold line but only the hot line was protected, the noise will persist. Arrestors also wear out over time as their internal gas charge degrades, typically after a decade or more, so an older unit may simply need replacing. And if hammer occurs at multiple fixtures rather than one specific valve, elevated supply pressure may be the underlying cause — worth ruling out with a pressure gauge before assuming the arrestor has failed. Our guide to testing your water pressure covers exactly how to check that.

Conclusion — Which Water Hammer Arrestor Should You Buy?

For most washing machine installations, the EFIELD S-241 2-Pack is the dependable default — stainless steel construction and a swivel fitting deliver a straightforward install covering both hot and cold lines. If price is the priority at the same connection type, the SECKWHALE Straight 2-Pack matches that build quality at a more accessible cost.

If your washing machine sits close to the back wall, the EFIELD MH-S-241 Angle 2-Pack is the only unit here built for that clearance problem. For the best all-in-one value, the SUNGATOR 2-Pack with Sealing Tape throws in the tape you’d otherwise need to buy separately. And for hammer at a dishwasher, sink, toilet, or faucet rather than the washing machine, the SECKWHALE Tee Compression 2-Pack is the only unit in this roundup built for that 3/8 inch under-sink standard. Whichever you choose, confirm the connection type and fitting size before ordering — that’s the detail most likely to turn a ten-minute fix into a return.

Prices and ratings may change. Always check Amazon for current prices.