With their high level of flexibility, these pumps are ideally suited for use in boats as bilge pumps, deckwash pumps, fresh water pumps and refuelling pumps for oil and diesel. These pumps may be combined with a vacuum switch for automatic operation. Full range of capacities from 15 - 55 L/Min. All motors are heavy duty to provide long service life, even under heavy use. Available in 12 or 24 volts. F4B-11 ULTRA BALLAST - CAPACITY 52 L/MIN 13.5 GPM: Designed to quickly fill or, when reversed, drain a ballast tank. Capable of pumping fresh or sea water, the pump's robust design can handle the rigors of continuous duty usage, is reversible and has a built-in thermal overload for added protection.