1. Performance Brass Seal: The flange pipe and threads of the water inlet fitting are made of brass, offering sealing resistance, withstanding pressure and extreme temperatures, resistant to rust, and featuring a long lifespan. 2. MultiProtection: The RV fresh water fill adapter is equipped with dual protection—a rubber cover and a filter screen—effectively preventing dust and debris from entering the valve and ensuring the cleanliness of the water source connected to the RV. 3. Builtin Valve: The RV inlet is equipped with a valve/backflow preventer, which prevents harmful contaminants from entering the RV's freshwater tank. When using the water tank and pump to draw water, it does not leak again, avoiding water waste. 4. Versatile Application: The threaded interface of the RV water fill inlet has an outer end of 3/411.5 NH and an inner end of 1/214 NPT, compatible with standard hose connections and suitable for RVs, trailers, boats, and offgrid water supply systems.