Replacement Jabsco 40psi Pressure Switch for use with old and new style pump systems. Suits Parmax 3 (J20-108 and J20-109)
Failure of a caravan style water pump can usually be attributed to the pressure switch. Designed to regulate the delivery pressure, the switch works by turning the pump off when the set pressure is reached, and turns the pump back on again if the pressure drops.
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