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O k I can track the noise down to the valve that supplies the downstairs toilet. I can cut the water supply off, flush the toilet and the slow turn the knob back to the supply and bam I have a tuba...

When I shut off the water I get a Fog Horn sound coming from my pipes. I can not tell where is really coming from as a I heard it from from all over. It does not seem to any certain faucet that...