Occasionally, if I notice the black tank valve not wanting to close all the way, I will open it back up, lift up the drain hose and open the grey tank valve so the grey water backs up into the black tank, flushing whatever is in the valve. I don't use one of the add-on valves at the outside location of our drain line, but that would also work.
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Bob & Becky
2012 3402 Montana
2012 Chevy 2500HD D/A CC
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