How To Look At A House
McGarry and Madsen's home inspection blog for buyers of
site-built, mobile/manufactured and modular homes
What are the pipes sticking out near my water valves?
Saturday, June 30, 2018
If it looks something like the copper-color cylinder shown above, then you have a “water hammer arrestor” installed to keep the pipes from making a banging sound when the water is shut off. You might see one at the washing machine faucet box or under any of the sinks of a newer home.
It contains an air cushion and piston that absorbs the surge of pressure on pipes when water is abruptly shut off, which can especially be a problem where there are electronic solenoid valves shutting water on and off at appliances like a washing machine or refrigerator ice maker. Shown below are some other examples of arrestors.
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