Jabsco 777 Series flexible impeller pumps are available in either a neoprene or nitrile flexible impeller option, both with 1 inch NPT ports, 5/8" diameter shaft, and face seal. Brass cam and impeller insert. Pumping capacity is 17.8 gallons/min at 1500 rpm. Total head at 1750 RPM. Self-priming to 7.8 ft vertical lift.