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I just installed a new sink and faucet and get really bad water hammer when I run the faucet. I never had this trouble before. I made sure the water supplies from the copper to the faucet is as short as possible. How can I fix it?

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Have you looked at How to fix “water hammer” in your house? – allindal Mar 12 '11 at 20:57
Thank you for your response, yes I have, my problem is localized to a faucet and only happens while water is on, not when it is shut off. – user2046 Mar 12 '11 at 21:40

With the water running, and presumably making the noise, put your hands on the copper pipe - can you feel the vibrations? Does it go away if you hold the pipe? (Be careful of the hot water pipe - it can get, well, hot)

It could be that the pipe is simply loose.

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