Jabsco 18916-0040 Replacement Pressure Switch - 40 PSI

The Jabsco 18916-0040 Replacement Pressure Switch – 40 PSI is an essential marine component for boaters and anglers who depend on reliable water pressure systems. If you've spent years on the water managing deck wash systems, live wells, or freshwater pressurization, you know that a failing pressure switch leaves you stranded without functional water delivery. This direct replacement switch maintains precise 40 PSI activation, ensuring your onboard water systems engage exactly when they should—whether you're rinsing gear after a long day of fishing or filling tanks at anchor.

Built to Jabsco's OEM standard, the 18916-0040 switch controls pump activation by sensing water pressure and automatically cycling the system on and off at the set 40 PSI threshold. This prevents system overpressurization while minimizing pump runtime and extending motor life—a critical detail when running off batteries in remote anchorages. The compact design (measuring 6 x 5 x 7 inches and weighing just 0.35 lbs) fits standard mounting locations across multiple Jabsco pump series, with no modification required. The switch itself is sealed against corrosion and salt spray, a must-have feature for saltwater anglers and offshore boaters who face relentless marine environments.

This replacement switch is engineered specifically for Jabsco 31595-Series, 31600-Series, 31620-Series, and 31630-Series pumps—the workhorse models found on center consoles, fishing boats, and cruising vessels worldwide. If your existing switch has become sluggish, fails to trip, or leaks, a direct swap-out maintains your original system's performance without rewiring or adapter plates. Installation is straightforward for any boater comfortable with basic mechanical work, and having a spare on hand ensures you're never caught without water pressure during an extended fishing trip or coastal cruise.