Upgrade or replace your RV's water fill hatch with this Valterra gravity water hatch. It's designed for filling your fresh water holding tank using gravity (no threaded connection required). The hatch is made from UV-stabilized black plastic to withstand sun exposure without cracking. It has a 1-1/4 inch barb connection for your water hose and a 1/2 inch air vent to allow faster filling and prevent airlocks. The outside dimensions are about 6 inches wide by 6-1/2 inches high, so it should fit standard RV openings. It comes with two keys and a lock to secure your water supply from unauthorized access. Installation is straightforward—just remove the old hatch and secure this one in its place. A must-have for RV owners who want a reliable, lockable water fill point. Works on most travel trailers, motorhomes, and campers. Keeps your water clean and secure on the road.