Hi i have a 1985 itasca windcruiser. The bathroom sink and the toilet drain into the black water tank. I have been getting the smell i the rv. I can just use the sink and the smell comes back. The vent isn’t clogged. I thought the smell was coming from where the pipe goes into the top of the tank but I sealed it and the smell keeps coming back. Anyone have this problem?
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Is this a new problem? If so, any recent changes? I have to close the roof vent in my bathroom or else I get the black tank smell when flushing. It would likely be the same if my sink drained into the black tank.