That is the anti-backflow device for the black tank flush lines. They are known to be a problem. You can replace it with another one - the brass ones last longer - or cut the lines down in the basement, join them together, and bypass the valve all together. Be sure to add an anti-backflow device at the black tank flush connector in the convenience center
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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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