Aqua Jet WPS pumps. The new generation of WPS pumps. Quiet and pulsation-free even at low speeds, the new Aqua Jet five-chamber diaphragm pump from Johnson Pump provides the perfect water pressure solution for both small and medium sized leisure and commercial boats. The WPS is fitted with a built-in pulsation dampening by-pass to control unwanted cycling and noise. Features: * Whisper quiet operation * Five-chamber construction * Self-priming * Easy, low cost maintenance * Quick-connect hose or threaded connectors available * Pressure switch standard * Long service life.