Drum pump, air operated, 3:1 oil ratio, max. flow GPM 3.7, max. GPM for oil 3.7, outlet size 3/4 in. FNPT, body material aluminum, steel, suction tube length (in.) 37, max. head (ft.) 34, max. pressure (PSI) 150, max. temp. (F) 122, ratio 3:1, delivers 2