The Homelite AUN31099 Pressure Washer Pump generates the water pressure needed for effective cleaning performance. It draws water into the pump and pressurizes the flow before delivering it through the pressure washer system. A properly functioning pump helps maintain consistent water output for removing dirt, grime, and buildup from various surfaces. Replacing a worn or damaged pump ... https://www.wholetoolbox.com/homelite-aun31099-pressure-washer-pump/AUN31099.html