Those things are prone to fail. I actually replaced mine with a Watts brass unit that can be rebuilt, and added an inline check valve. It is a vacuum breaker/checkvalve. Basically, it is there so when you flush your tank, and shut off the water source, it does not let black water siphon back through the flush line. I bought mine off Amazon, and they have them basically just like yours.
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Will
2013 Chevy 3500HD
2012 Rushmore 38CK
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