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Old 09-06-2017, 07:47 PM   #4
rohrmann
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Join Date: Oct 2012
Location: Box Elder
Posts: 4,677
M.O.C. #12947
You might try getting one of those add-on Valterra valves you install on the drain outlet where you connect your drain hose, close it and start adding water with whatever high power detergent you choose, maybe even hot water with dishwasher detergent, and run enough water into the black tank so the entire valve should be covered. Let this sit for a few days, then bring the water level up so the water is backing up almost into the toilet. Do this with the stuck valve open. Then, drain the entire tank while running more water into the toilet. Once the water has run for a while, then try closing the valve that you were unable to close all the way. You may find the TP that was keeping it from closing has dissolved and you don't need to replace the valve. We had a couple stay with us in our rig when we had it out on our shakedown trip years ago, and one of them disposed of one of those moist wipes down the toilet, which proceeded to get stuck in the valve, and no amount of water would move it. That was a quick $250 lost that the RV shop charged to remove the wipe.
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