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...
Very common on black tank valve to get a piece of tissue stuck in the blade of the valve. Usually requires taking the valve apart and simply cleaning the channel that the blade seats into. That age trailer should not require a replacement.
I have been able on occasion to completely fill the black tank with fresh water and flush out the debris.
Is this a remote valve with a flexible cable to it?
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