I started having this problem as well right after replacing the pressure regulator. I've tried increasing the pressure up to 80psi as well as reducing it down to 45psi, but the humming/whistling noise still occurs anytime the faucets are turned on less than half way and/or after flushing the toilet and also right after turning faucets off. I know it is the pressure regulator since that is the only change and it also vibrates slightly when it "hums/whistles". Any ideas?
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New Pressure Regulator Humming/WhistlingPage Title Module
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