Gusher Galley MK3 Foot Pump RightHand Lever GP0550 Smooth double action. Self primes and operates dry without damage Handsfree operation. Right oriented foot lever Easy installation. Multi directional inlet and outlet hose connections, 3 mounting options, including thru bulkhead Pumps fresh and salt water 4 US gallons per minute Also ideally used to prime Whale In-Line Booster pumps. Not for use in pressurized systems