What kind of pump does this SPX4500 power washer feature? This pressure washer features a three cylinder axial piston pump with 2 one-way valves for each cylinder. Related articles Can I use disinfectants as detergent with my SPX4004-MAX pressure washer? Find Your Snow Joe / Sun Joe User Manual (All Models) Why does my pressure start and stop as soon as I turn it on? Why is my SPX-FC34-MAX not dispensing detergent? Are these accessories compatible with my Pressure Washer?