Positive displacement pump alternative to 3 pistons for use of washing groups and industrial plants. Possibility of direct connection or via coupling with elastic coupling to different engines types. Pump body and covers in die-cast aluminum alloy. Rear cover with drain and oil level. Movement of the pistons realized through the system of the connecting rod - crank. Steel shaft pump high resistance printed. Oversized Main bearings. Connecting rods made of special cast aluminum alloy with anti-friction properties.