Yamada Pumps NDP-25BSN Type, Model 851538 NDP-25 Series, Air Operated Double Diaphragm Pump, BunaN Diaphragm, BunaN Flat Check Valve / O-Rings, Stainless Steel (316) Material, 46.2 GPM Max Flow, 1″ NPT Fluid Port, 3/8″ Female NPT (includes ball valve) Air Inlet, 3/4″ Female NPT (includes silencer) Air Exhaust, Aluminum Air Motor, 18 Feet Max Suction Lift