Equipment / Tools
- Bucket or towel
- Tongue-and-groove pliers or adjustable wrench
- Old towels
- Water hammer arrestor
- Plumber’s thread seal tape
How to Fix Water Hammer With a Water Hammer Arrestor
Turn off Water
Shut off water to the clothes washer, dishwasher, or other areas that experience water hammer. The device usually will have a shutoff valve that can be turned clockwise to shut off the water. In some cases, you may find an intermediary shutoff valve farther up the line. For installing multiple water hammer arrestors, you may want to shut off the home’s entire water supply.
The washing machine will have two shutoff valves, one for hot and another for cold. The dishwasher will have one shutoff valve for hot.
Use a basin to catch spilled water from disconnecting the water. Have a few old towels nearby, too. Use tongue-and-groove pliers or an adjustable wrench to turn loose the hose fittings.
Wrap Thread Seal Tape
Wrap the male end of each shutoff valve or water inlet with thread seal tape. Wrap tightly three or four times clockwise. Wrap any male threads on the water hammer arrestor with tape, too.
Install the Water Hammer Arrestor
- Threaded: For threaded water hammer arrestors, thread the device onto each valve or inlet. Turn the female fitting clockwise by hand, then tighten with the pliers.
- Compression: For compression fittings, slide the compression ring against the valve, then thread on the compression nut and tighten.
- Push-Fit: Push-fit water hammer arrestors need no tools for installation (though removal does require a small plastic tool). Clean copper tubes of burrs. Make sure that all cuts are square. Push the fitting firmly onto the pipe.
Connect Supply Tube or Hoses
Use the pliers or the wrench to connect the water supply tube or hose to the water hammer arrestor. Tighten the connection.
Turn on Water
Slowly turn on the water supply by turning the shutoff valve counterclockwise. If you shut off the water to the entire house, faucets may sputter before water begins running freely again. Use a flashlight to visually inspect the connections for leaks. Run every appliance on a water hammer arrestor on one test cycle.
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