Base mount, 1 1/4 port, 1 1/2 hose. 15 gallons per minute. The large openings on this diaphragm pump speed up most pumping jobs. The rugged housing is impervious to many fuel oils, solvents and detergents. The bodies are non-corrosive and non-sparking. Use these pumps to dewater bilges and holds or transfer watery sewage to or from holding tanks. Self-priming, capable of a 12' suction lift.