Aro pro series non metallic double diaphram pneumatic pump, model 6661aj-344-c, serial # spb1194256. Feautres polypropylene wetted parts with teflon diaphrams, rated for 47 gpm, maximum operating pressure 120 psi, maximum solids . 125", 1" inlet and outlet with female npt connections, aluminum air chamber, 1/4" air inlet, maximum dry lift suction 15', maximum fluid temperature 150 f. Formerly used in dermitoligical products.