Amarine-made 3700 GPH 12v Boat Marine Plumbing Electric Bilge Pumps (3700gph 12v) The Amarine-made submersible bilge pumps are tough enough for any bilge. High Flow: for use from 22-234L / Min (1.32-14.04 cubic meters / hour) Small size, high efficiency, low current (low cost switching power supply supporting); to achieve a small size perfect combination of high flow Unique automatic "discharge" function can bear the long-term continuous operation under nearly congestion condition Impact resistant ABS housing. Heavy duty motors with stainless steel shafts and tough. thermoplastic bodies