Upgrade the RV vacuum breaker check valve and say goodbye to leaks and contaminated water. RV Vacuum Breaker Check Valve: fit for b&b Model 571 Check valve,This check valve is a part of the black tank flushing system and installed between the freshwater inlet and the tank flusher.
Installed between the freshwater inlet connection and the tank flusher, this vacuum breaker valve allows black tank water to mix with grey water while keeping the freshwater source clean and healthy.