Johnson Pump Aqua Jet WPS 4.0 GPM Water Pressure Pump - 24V [10-13406-104]Aqua Jet WPS 4. 0 GPM Water Pressure Pump 24V Quiet and pulsation free even at low speeds, the Aqua Jet five chamber diaphragm pump provides the perfect water pressure solution for both small and medium sized leisure and commercial boats. Efficient and compact, Aqua Jet pumps are particularly suitable where low amperage and sound levels in relation to water flow are at a premium such as in shower and galley applications. Operates in fresh or seawater.