UPGRADED CONSTRUCTION: Crafted from premium brass in , the vacuum breaker check valve body offers enhanced durability. Opting for a one-piece spool over a spring and ball design allows for improved sealing and quieter operation, while maintaining a high sensitivity to water pressure.FUNCTION: This RV black tank anti-siphon valve is compatible with the Model 571 Check valve. It is part of the black tank flushing system and is installed between the freshwater inlet and the tank flusher. Its design to prevent backflow and back-siphonage, ensuring the cleanliness and health of your freshwater sourceEasy To Install: Our vacuum breaker check valve features 1/2 inch NPT male threads on both the inlet and outlet, allowing for easy installation. When replacing your old check valve, the correct installation direction: clean water should flow in the direction indicated by the inchFLOW inch arrows on the valve body. Once confirmed, connect the check valve to the pipeline.Note that the installation position should be approximately 6 inches higher than the flusher, and vertical installation must be ensured. Before installation, it's essential to cut off the water source and empty any residual water in the pipelineCompatible Model: Compatible for River / 21 Grey Wolf / 2014 Wilderness / Passport / 2018 Winnebago / 2011 TT / 2015 Tiffin Open Road / 2007 Montana / Fifth Wheel / 2019 Sprinter.WIDE APPLICATION: The 571-VAC-CHK-A RV tank flush one way check valve is a dependable replacement for damaged or leaking check valves, providing efficient water flow. It is suitable for a range of RV models, campers, travel trailers, and motor homesColor: GoldMaterial: BrassRaw tape Random colors, Not accepting designationPackage Contents:1 x Brass RV Backflow Preventer Valve1 x Raw tapeOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.