Identifying a failing pressure reducing valve (PRV) involves monitoring several distinct plumbing symptoms. Major warning signs include sudden, drastic fluctuations in household water pressure (ranging from dangerously high spikes to extremely weak flow), loud banging or whistling noises coming from pipes when fixtures are opened, water pressure that drops to a trickle whenever multiple faucets run simultaneously, or visible water leaking from the PRV housing body itself. Verification: Test household water pressure with a gauge at an outdoor spigot and observe if the PSI reading is erratic or unadjusted by the valve nut.
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