Series 20 3:1 Medium-Pressure Stainless Steel Transfer Pump. Recommended for use with antifreeze, solvents and windshield washer solution. 316 Series stainless steel construction and Teflon packings assures long lift. 3:1 ratio pump for transfer of corrosive or toxic fluids. Mounts on 55-gallon bung opening drums. Delivers 2.5 gallons per minute. Lasts longer than carbon steel models in corrosive service. Maximum air pressure 125 psi.