This self-priming pump pumps waste water from the shower and water from the bilge. Also used to drain the galley sink, if sink is below the waterline. This diaphragm pump can pump mixtures of air and water. The 3/4″ O.D. hose inlet and outlet valve can be rotated to various positions and mounted horizontally or vertically. Ports: 3/4 hose barbs. Dimensions: 4-1/2″ H x 5-1/4″ W x 10-3/4″ L. Maximum head and lift: 13 feet. Weight: 3.5 lbs.