Johnson Pump Aqua Jet WD 3.5 GPM 12V Washdown Pump Kit

The Johnson Pump Aqua Jet WD 3.5 GPM washdown kit is the setup you rig up when you're tired of hauling buckets over the gunwale after a day on the water. It's a complete 12-volt deck wash system built around Johnson's five-chamber diaphragm pump, and it moves 3.5 gallons a minute at up to 70 psi. That's enough pressure to blast fish blood off the deck, rinse mud off the anchor chain, or knock salt spray off the hardtop before it dries and hazes your gelcoat.

Here's what you get in the box. The pump itself, a PUMProtector inlet strainer, a 25-foot coiled hose with a 1/2-inch inside diameter, a bulkhead fitting with a shutoff valve, and a spray nozzle with a built-in check valve. Johnson also throws in the barb port fittings and hose connectors, so you're not making a parts-counter run halfway through the install. Everything threads together with 3/8-inch BSP by 1/2-inch barb ports.

What does 70 psi actually buy you? Faster cleanup. At 5 bar the spray has enough bite to lift dried salt and slime without you scrubbing, and the higher pressure means you use less water to do the same job. That matters when you're rinsing off at a mooring or running the washdown off the same tank that feeds your other raw-water systems. Lower-pressure pumps just push water around. This one cleans.

Typical jobs it handles without complaint:

• Rinsing salt spray off the hardtop, windshield, and canvas
• Washing fish blood and bait slime off the cockpit sole
• Cleaning mud and weed off the anchor and rode as it comes up
• Knocking sand off feet, coolers, and gear before they hit the deck
• Deck-side cleanup at the dock when the hose won't reach

Who's this for? Center consoles, walkarounds, and cruisers in the 20 to 30 foot range where you want a real deck rinse without running the bigger 5.2 GPM pump. The 3.5 flows plenty for a single hose station. If you're washing down a big sportfish with two anglers going at once, step up to the larger pump. But for most boats, this is the sweet spot between water volume and current draw.

Mount it right and it'll run quiet and last. The five-chamber diaphragm design is smoother than an old two-chamber pump, but any washdown pump makes some noise. We tell folks to set it on rubber isolation mounts and put it somewhere it won't drum against a hollow console panel. Keep the suction run short, mount the pump low relative to the water source, and the built-in pressure switch cycles cleanly instead of hunting.

The one thing that kills these pumps early is grit. Saltwater and sand chew up diaphragms and valves if you skip the strainer. Johnson's PUMProtector screen is in the kit for a reason, so plumb it inline on the suction side and rinse it out now and then. Do that and you'll get years out of it. Skip it, and you'll be pulling the head apart after a couple of seasons.

Wiring is straightforward. It's a 12-volt DC pump that draws in the neighborhood of 6 to 8 amps under load, so run it on 14-gauge wire with a 10-amp fuse and you're set. The included two-way panel switch drops into a standard dash cutout. If you've wired a bilge pump or a livewell, you can handle this in an afternoon.

A couple of real-world notes from folks who've lived with these. The coiled hose is handy for storage but it can kink if you yank it around a hard corner, so route it with a little slack. And that pressure switch is doing the work of turning the pump on and off as you squeeze the trigger, which means you can leave the pump powered at the panel and just grab the nozzle whenever you need it. No separate valve to fumble with.

Bottom line, it's a proven, no-drama washdown setup from a pump maker that's been building marine diaphragm pumps for decades. Rig it up once, feed it clean water through the strainer, and it'll rinse your deck for a long time.