3-piston alternating volumetric pumps for use on cleaning units and industrial systems. Can be coupled to various types of motors, directly or with flexible joint. Flange for gasoline engine ø1″ SAE J609a included. Pump body in die-cast aluminium alloy with oil drain outlet. Rear cover in die-cast aluminium alloy. Pistons driven by crank-connecting rod mechanism. Pump shaft in pressed high-strength steel. Oversized friction bearings. Connecting rods in bronze. Pistons in ceramic-coated stainless steel . Pump head in pressed brass. Double gasket sealing system. Intake and delivery valves have plugs for easier maintenance. Integral regulating valve.