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I have 2 bathrooms with a common wall. We hear a constant low tap of the pipes in the wall between the bathrooms. We have checked toilets, sinks, faucets, etc for leaks. Sounds as if there is pressure or something causing the noise.

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You have water hammer effect it is caused by a fast closing valve,it can be solved by installing a water hammer arestor in the plumbing line or maybe the water pressure is too high and a pressure reducing valve can be installed in the main water line.(the pipes in the wall are not secured properly that's why they vibrate)

Posted on Jun 14, 2011

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Posted on Jan 02, 2017

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