Johnson Pump Washdown, Aqua Jet. Quiet and pulsation free, th efive chamber diaphragm pump provides the perfect deck wash solution for both small and medium sized leisure and commercial boats. With a pressure of 5 bar, clean-up is faster and easier than ever before. CE-approved. Whisper quiet operation, self-priming, easy, low cost maintenance, quick-connect hose, inline strainer and trigger nozzle included, long service life. 1/2 NPT/hose 3/4 , GHT 3/4 12volts, 20 amps, 37 psi, 3. 5GPM.