Quote:
Originally Posted by Cyanide
....and the truest answer to my problem has come to light. There is a crack right above where the cleanout branches from the main pipe. That is the most "smoking gun" I have come across yet.
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Yep that will do it also. That's ABS pipe and extremely common for it to do that - which is why it's not used anymore. Replace as much of it as you can with PVC.
Have fun -
Ron