I had to replace a bath tub in a 40 year old Ranch house. For the new connection I installed a PVC drain from the tub which is then connected to the originally installed copper or bronze pipe with a rubber sleeve. This copper/bronze pipe reduces the size of the cast iron drain pipe to the 1 1/4" copper/bronze. The copper/bronze is stuffed onto the cast iron joint just above the P-drain with some sort of sealer around it. When I did the leak test - filling the tub and then letting it drain...I started getting a slow leak when the tub was about 1/2 empty. The leak is where the copper/bronze pipe goes into the cast connection. Any thoughts how to stop this leak? Do I try to scoop out the sealer and reseal with something? I'd appreciate any suggestions.
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PVC to copper to Cast connection