Gravity Fresh Water Fill Hatch Lockable Gravity Water Inlet Filler Dustproof Gravity Fresh Water Fill Hatch Inlet RV Accessories. Feature: 1. Quality Materials: The gravity fresh water fill hatch is made of superior materials: a lock core of zinc alloy, an iron key, and a stainless steel spring with a body made from PP. 2. Aesthetically Pleasing: With its sleek and simple design, the inlet filter not only functions well but also adds an aesthetically pleasing element to your vehicle. 3. Simple and Reliable Structure: The gravity water inlet filler features a simple yet reliable structure that ensures its effectiveness and durability. 4. Easy Installation: The simplicity of the water inlet fill extends to its installation process. 5. Versatile Application: Suitable for a wide range of vehicles including cars, ambulances, boats, trailers, and recreational vehicles.