Caravan Water Fill Cap with Gravity Lock Water Tank Filler Port Inlet Hatch Filler Cap Set Suitable 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 for convenient water entry. Includes a seal ring to prevent leakage, dust, and water ingress. 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 prevents water backflow during filling. Made from environmentally friendly materials resistant to aging, with good toughness and crack resistance. Gravity Water Inlet and Fresh Water Filling Hatch with Lock - Designed for use on motorhomes, caravans, trailers, RVs, and boats. Compatible with various models. Specifications: Package includes 1 pc Water Fill Cap Note: Due to manual measurement, there may be a 2-4 cm variation