It was Drain Master. The fellow said in many cases the mounting area is too tight to install the unit in the correct position, so they(factory guys) rotate it and that allows the valve to trap paper and other things in the rubber seal. If installed right, nothing will become trapped and the valve will seal every time.
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2013 Tiffin Allegro 34 QFA
2015 Cadillac SRX (towed)
2019 Tesla Model X
1991 Avanti Conv
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