Reply To: Water Hammer problem

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This doesn’t sound like typical water hammer. Water hammer occurs when a valve *shuts* – i.e., after the toilet tank has stopped filling. The “hammer” results from moving water immediately stopping as the valve quickly closes.

If you are getting a clunk when you flush it is probably something else – perhaps a pipe in the wall is loose, and when the valve opens and water starts moving it causes the pipe to move slightly, bouncing against a stud.