This recessed water inlet is made of metal with a powder coat finish. It has a garden hose swivel fitting with a gripper to make it easier to screw your campground pressure hose to the inlet. Includes a press-on dust cap.
The overall diameter is 4-5/8". Your trailer skin cutout size will need to be 3-1/2".
Includes a brass check valve. The back has a 1/2" FPT inside connection. Easily attach a 1/2" PEX line to it with a Sea Tech adapter like these. Use thread tape.