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I am hearing a whistling sound that seems to be connected to the plumbing system. It comes and goes at times, but I can't find the cause of it. What could cause this?

The sound you are describing is usually caused by a toilet fill valve that is slowly leaking. To locate the leaking toilet, remove the lid of each toilet tank and adjust the fill valve mechanism until it stops. Once you have found the noisy toilet, repair or replace the fill valve.

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