Features： 1、Prevent Backflow: These check valves efficiently prevent any backflow from the black water tank system, ensuring its proper functioning and making your camping trips cleaner and safe. 2、Ideal Replacement: In case your black water tank system starts leaking or producing abnormal noises, just replace it with this valve to solve the problem and enhance system performance. 3、Sturdy Material: Made of high strength material, this black tank check valve is sturdy and robust, resistant to erosion and high temperature, ensuring durability for long term use. 4、Easy Installation: The check valve backflow preventer is designed to be user friendly and can be installed easily without any hassle, no complex tool or special steps required, saving your time and effort. 5、Versatile Use: This vacuum breaker check valve is specifically designed for the black water tank of campervan and RV, making it an essential accessory for your recreational vehicle. Specification： Item Type: RV Black Tank Check Valve Color: Black Material: ABS Working Pressure Range: 8-125 PSI Fitment: Suitable for Campervan RV Black Tank Package List： 1 x RV Black Water Tank Check Valve 1 x Waste Tube