Caravan Water Fill Cap With Gravity Lock Water Tank Filler Port Lock Inlet Hatch Filler Cap Set For Motorhome Camper Features Gravity Water Inlet Fill Dish Hatch Lock - Gravity Fresh Water Fill Hatch Inlet Filter Lockable For RV Boat Trailer, Gravity Water Inlet Filler Neck Lockable Caravan Hatch Tank, RV Plastic Inlet Boat Fresh Accessories for RV and Filter Trailer. Cover Design - The cover is designed with industrial curved texture and 45 degree water inlet design. It is more convenient to enter the water. The seal ring is designed to prevent leakage, dust and water leakage. Gravity Water Inlet Lockable Cap with Lock for Most Fresh Water Inlets on RV Motorhomes Caravans and Boats. Reverse Vent Design - The reverse vent design of the vent hole does not cause water backflow when water is added. Environmentally friendly materials, resistant to aging, good toughness and not easy to crack. Water Inlet by Gravity and Fresh Water Filling Hatch with Lock - Gravity design,Water filling hatch for motorhome, caravan, trailer. It can be used on a variety of models such as RV and trailer. Specifications Package Include:1pc*Water Fill Cap Note: Due to different personal measurement methods, there will be an error of 2-4 cm, please understand Thanks for your support