Description: Unique Function: This RV city water fill inlet can prevent backflow after the water supply is stopped. It ensures a sealed and fast water supply with fast water supply. Exact Size: The water opening size is 90 mm in diameter, and the water pipe diameter is 20.2 mm. The mounting screw hole spacing is 85mm and the screw hole diameter is 5mm. Inlet Fill Cap: Our RV water fill inlet built in water stop valve comes with a standard hose connector with a diameter of 20.2 mm, making it compatible with most hoses on the market. Multi purpose Use: This Gravity Water Inlet Fill Dish is ideal for modified vehicles, campers, tool trucks, , RVs, yachts and other places where stable pressure is needed to add city or fresh water. Easy to Install: To install this Water Fill Inlet Built in Check Valve, just choose your location and drill a 90mm diameter round hole in the wall. Size Chart: 11.7cmx11.7cmx7.5cm/4.61inchx4.61inchx2.95inch Package Includes: 1 RV city water fill inlet 1 quick connector Note: Please allow slightly errors due to manual measurement and different monitors.