RBKM
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We are adding a new master bedroom/bathroom. In addition to running new 3/4" pipes to the new bathroom, our plumber upgraded some of our other pipes by replacing our existing 1/2" pipe that led to and from our hot water heater with 3/4" pipe. Since then I've noticed a funny noise in our old downstairs bathroom. After we flush the toilet, at the very end of the tank fill, we hear a double knocking sound that comes from the bathtub that is in that bathroom. Any idea what that might be?
-Rob
-Rob