Hidden Black tank valve
We have a 2017 Vegas 25.3 which we just purchased. Today, on our third trip out, we discovered a third valve just behind the tailpipe on the passenger side. We had dumped both the black and gray tanks, but until we emptied that THIRD valve we were experiencing horrible smells! Nothing in the documents mentioned this valve. Had we not accidentally found this, I fear we would have experienced a severe backup issue!
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