Alternative volumetric pump with 3 pistons for use on washing units and industrial systems. Possibility of direct connection with hydraulic motor. Pump body and covers in die-cast aluminium alloy. Rear cover with oil drain and oil level. Movement of the pistons realised through the connecting rod-crank system. Pump shaft in moulded high-strength steel. Oversized main bearings. Connecting rods in special zinc alloy - die-cast aluminium with anti-friction properties. Possibility of bronze connecting rods. Full ceramic pistons. Pump head in stamped brass. Double seal sealing system. Possibility of different types of sealing systems according to the application. Valve plugs for both suction and delivery for better maintenance.