Yamada NDP-25BPV 852387, Air Operated Double Diaphragm Pump with Viton Diaphragm. Viton Valve & O-Rings, Polypropylene (PPG) Material, 46.2 GPM Max Flow, 1″ Female NPT Fluid Port, 3/8″ Female NPT (includes ball valve) Air Inlet, 3/4″ Female NPT (includes silencer) Air Exhaust, Glass-Filled Polypropylene Air Motor & 18 Feet Max Suction Lift.