Specifications : Ge-85-le Ace Pump (engine Not Included Mfg #: 60011 Max Psi: 65 Gpm: 24 Shaft: 3/4" Round Keyway Suction: 1" Discharge: 3/4" 1" X 3/4" Npt Polypropylene Centrifugal Gas Engine Driven Compatible W/stock 5.5hp Engines