That's a Thetford Style II vacuum breaker, part number 34122. It's not the water valve on that model. We haven't had that problem with ours, so I can't say if it causes your bowl to keep filling.
The water valve is hidden between the foot pedal and the base, and is part number 42049.
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Think you're too old to cry or swear out loud...walk into your hitch in the dark.
2012 Jay Flight 19RD
2016 Ford F150 XLT 2X4 SC 3.5L Eco Max Tow
2010 Tundra TRD DBL Cab (Traded)
2 new fluffy Corgis, Bayley and Stanley
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