The box allows the connection of the on-board water installation with that of the dock. Which allows not to waste the water in the tanks. The complete box includes: an ABS box with a watertight lid, a 3 bar pressure reducer, a male quick connector. Connection to the on-board network with 3/4 ”male thread. Delivered without check valve. Straight outlet + 90 ° elbow, built-in ø: 69 mm. Internal projection 90/120 mm.