Alternative volumetric pump with 3 pistons for use on washing units and industrial systems. Possibility of direct connection or through coupling with elastic joint to different motor types. Pump body and covers in die-cast aluminum alloy. Side cover closed or with oil level. Rear cover with drain and oil level. Movement of the pistons realized through the system of the connecting rod - crank. Pump shaft in high resistance pressed steel. Oversized main bearings. Connecting rods in special zinc alloy - die-cast aluminum with anti-friction properties. Full ceramic pistons. Pump head in stamped brass. On request pump head in nickel-plated brass. Double seal sealing system. Valve plugs for both suction and delivery for better maintenance.