Features: 1. Wide Application: Gravity water fill inlet is an auto hatch, perfectly applicable for RV, motorhome, camper, trailer, caravan. 2. Durable Material: Made of high-quality food-grade PP stabilized plastic with stable performance and high reliability. 3. Faster Filling: Gravity water inlet features a 10mm/0.39in air vent for faster filling and a 40mm/1.58in connection barn. 4. Spring and sealed ring design, effectively leak-proof and anti-loosening, bringing more convenience. 5. Safe Installation: The premium gravity water fill inlet is lockable and comes with 2 keys to ensure safe water usage. Specification: Item Type: Water Fill Inlet Material: PP Color: White Opening Diameter: Approx. 78mm/3in Applicable Casement Door Thickness: Approx. 30-40mm/1.18-1.58in Application: For RV, motorhome, camper, trailer, caravan Package List: 1 x Water Fill Inlet 2 x Key 1 x Sealing Ring 4 x Fixing Screw