I have moaning pipes in a 17 year old house. When no water is running, at inconsistent frequency, for 15-120 seconds, there is a load, house-wide vibration in the pipes. It seems to be generating near the PRV. Is that a sign of a bad PRV? I already eliminated bad flapper valves as the culprit by turning off the supply; noise stilll occurs. Can I get a replacement PRV at HD? Can I do the job?
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