On our 2015 Montana 5ver, when the black valve is closed exit pipe continues to drip. There seams to be some kind of debris in seal preventing it from completely sealing. Is there any kind of chemic...
Replacement is likely, but sometimes this old trick will work. After empting the tank run clean water into it either with a hose or via a tank cleaner.
As the tank is draining clean water work the slide back and forth several times. Sometimes all that action will dislodge what is stuck and it will wash out.
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