Most everyone here had had their bad experiences with black/gray valves. The best solution is to replace them with Valtera valves. A Search here will uncover numerous posts on repair/replacement (including this one here).
Also add a Vatera twist on valve on the end of the sewer pipe to avoid those nasty surprises from leaky valves.
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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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