Upgraded diaphragm pumps Lincoln now offers its upgraded Model No. 85634 and Model No. 85635 air-operated, UL-listed diaphragm pumps, which deliver higher flow rates and greater solids handling capability. Each pump features the no-lube air valve and grounding wire, and a one-inch inlet and outlet. The two models have aluminum construction with a choice of Buna or PolyTetraFlouroEthylene (PTFE) wetted soft parts.