Overview

The Jabsco 18916-0050 is a 50 PSI replacement pressure switch for selected Jabsco diaphragm pumps used in onboard freshwater and washdown systems. It controls the pump shut-off point, so the 50 PSI setting matters when you are replacing a worn switch and want the pump to cycle the way the original system was set up.

This part is used on selected Jabsco pressure-controlled pump applications, including PAR-Max and some washdown pump setups that run a 50 PSI switch. On a boat, that usually becomes relevant when the pump no longer starts consistently, keeps running after outlets are closed, or cuts in and out at the wrong point. Matching the existing switch rating and pump family is the important fit check here.

Key features

• 50 PSI pressure switch setting for Jabsco pump installations that use a 50 PSI shut-off
• Replacement switch for selected Jabsco diaphragm pumps in freshwater delivery and washdown circuits
• Useful repair part when a pressure-controlled pump will not start properly, will not shut off cleanly, or cycles incorrectly
• Service on supported pumps is done at the pump head after power is disconnected and system pressure is relieved

Compatibility and fit

Fit depends on the pump series and the pressure setting already in service. Jabsco uses different pressure switch versions across its diaphragm pump range, so this part should be matched to a pump that uses a 50 PSI switch rather than a 25 PSI, 40 PSI, or 60 PSI setup. It is a sensible match when you are replacing the original switch on an existing Jabsco pump and can confirm the same rating on the current assembly.

Because this is a service part for the pump assembly, it belongs on a pump mounted in a dry and accessible location. It is not a stand-alone deck fitting or a universal switch for any water pump, so checking the existing pump model and switch rating before install matters more than the boat type.

Installation and setup

Before replacing the switch, disconnect power to the pump and open a faucet or valve to relieve line pressure. On supported Jabsco pumps, the pressure switch sits under a rubber boot and is held in place with visible screws, which makes this a practical repair when the rest of the pump is still in serviceable condition.

This part is a good match for owners maintaining an automatic water or washdown pump on a cruising boat, fishing boat, or workboat where the original pump is still worth keeping in service. It is most relevant when the fault is isolated to the switch rather than the diaphragm, valves, or full pump head.