I would not jump to the conclusion it is the valve (whatever the proper name is). Much more likely is the check valve in the water pump is leaking and allowing shore supplied water to back flow into the fresh water tank.
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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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