A water hammer arrestor should always be installed as close as possible to the fast-closing valves that generate the hydraulic shock. Prime locations include the hot and cold water supply hookups directly behind washing machines, beneath kitchen and bathroom sink angle stops, and inline on supply lines feeding single-handle shower mixing valves or automatic ice-maker refrigerators. Placing the arrestor close to the source intercepts and neutralizes the shock wave before it reverberates through your entire home. Verification: Inspect the installed arrestor connections with a dry paper towel to confirm zero leaks.
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