Steven Levy Enterprises buys and sells new, unused, and used industrial surplus diaphragm pumps. Browse our inventory of used diaphragm pumps available for purchase. A diaphragm pump is a positive displacement pump that uses a combination of the reciprocating action of a rubber, thermoplastic or teflon diaphragm and suitable valves on either side of the diaphragm to pump a fluid. Diaphragm pumps are commonly used in mixing tanks, filling machines, filter presses, air spray, general unloading and transfer of fluids, and many more applications. Tell us what surplus diaphragm pumps you have for sale or call us at 713-910-4337.