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The POS valves used by Keystone don't tend to last long. Replacing the valve with a Valterra one is relatively easy and only takes a couple of hours. Do a Search on "black tank valve" and you should get lots of hits. There was a discussion on this subject just last month.
Additionally, install a Valtera gate valve on the end of you sewer pipe and avoid any future surprises.
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Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB
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