- RV VACUUM BREAKER CHECK VALVE: Specifically designed for BB 571 check valves, this vacuum breaker is a crucial component of black water tank flushing systems. It is installed between the fresh water inlet and the tank flusher to prevent the mixing of black tank water with grey water, ensuring a clean and safe water supply. - DURABLE CONSTRUCTION: Made from high-quality brass, the 571VACCHKA RV Vacuum Breaker Check Valve can withstand water pressures of up to 8125 PSI. Its robust construction makes it less prone to corrosion and cracking in cold climates, providing superior performance and longevity compared to plastic alternatives. - EASY INSTALLATION: This valve can be easily fitted into a caravan's black water tank flushing system. It should be installed at least 6 feet above the highest point of any component connected to the waste water tank. For those unfamiliar with plumbing, consulting a professional plumber for installation assistance is recommended. - VERSATILE APPLICATION: This vacuum breaker check valve is compatible with all models of caravans and campers, effectively preventing black water from siphoning back into the RV freshwater system. It is a reliable solution for travel trailers and motels, serving as a robust alternative to damaged or leaking check valves. - USE SCENARIOS: - Ideal for RV owners looking to maintain a clean water supply while using black water flushing systems. - Perfect for those traveling in colder climates, where plastic valves may fail due to freezing temperatures. - A must-have component for camping trips, ensuring that your fresh water remains uncontaminated.