1. There is a built-in water stop valve to prevent backflow after water is stopped, seal the water supply to reduce pollution, and quickly fill the water. 2. The product is made of modified plastic material, which has good toughness, high strength and good UV resistance. 3. The threaded pipe adopts brass pipe thread, the thread is highly precise, sealed and durable, and the connecting cap can effectively prevent the cap from being lost. 4. The standard hose connector has a diameter of 20.2mm and can be connected to most hoses on the market.Scope of application: Modified vehicles, tool vehicles, campers, RVs, ATVs, yachts and other places that require stable pressure to add water or add water in cities. 5. Installation method: Select the location to open a 90mm diameter round hole, wall-mounted installation Product: Back Flow Water Filling Port Color: Black Material: plastic Package Contents: 1 x pressure regulating connector