Johnson Pump 3.5GPM Aqua Jet Washdown Pump The Johnson Pump 3.5GPM Aqua Jet is a pulsating washdown pump that allows for quiet cleaning of recreational equipment. The 5 bar high pressure allow for easier and fast clean up. The five chamber construction allows for smooth flowing of water with self-priming functionality. The pump offers low power consumption and the ability to run dry without damaging the pump. When the spray nozzle is opened and closed the integrated pressure switch automatically