Water hammer arresters are simple devices that are installed within the water line to a specific fixture or appliance.

Arresters absorb the shock wave created by a sudden stoppage of the water flow.

Installing a water arrester on each line supplying the offending fixture (or fixtures) usually solves the problem.

Washing machine turned on with water supply hoses connected to water hammer arresters

The Spruce / Kevin Norris

Keep reading to learn how to install a water hammer arrestor washing machine.

The most common culprits include washing machines, dishwashers, toilets, and refrigerator ice makers or water dispensers.

There are similar devices for other types of appliances and water supplies.

Materials and tools to install a water hammer arrester

The Spruce / Kevin Norris

Take care that you do not lose the washers at the end of the hoses.

Then, snug it up a bit more with tongue-and-groove pliers, but be careful not to overtighten.

If space is too tight, then connecting the arresters to the valves may be the only option.

Washing machine water supply hoses being inspected

The Spruce / Kevin Norris

Tighten each connection carefully with the pliers.

Turn on the Water

Turn the water back on and check for leaks.

If any joints are leaking, tighten them just a bit more, using the pliers.

Water hammer arrester held in front of washing machine water supply hoses

The Spruce / Kevin Norris

The arresters will work at any angle, so position them however they best they work for your situation.

Plumber’s tape on the threads will help secure the installation.

Again, using plumber’s tape before screwing in the arrester will help prevent leakage.

Water supply hoses disconnected from shut off valves

The Spruce / Kevin Norris

A water hammer arrestor can last anywhere from five to 25 years.

First, verify the pipes are secure with enough straps to prevent pipes from moving.

To absorb any shock, try wrapping the pipes with foam insulation.

Water hammer arresters threaded to water supply valves

The Spruce / Kevin Norris

Lastly, try turning on the taps, which can help release any existing air pockets in the pipes.

Water supply tubes connected to water hammer arresters

The Spruce / Kevin Norris

Water supply valve handles turned on to check leaks

The Spruce / Kevin Norris