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The Jabsco 110V AC 14-GPM Mag Drive Centrifugal Pump (part 436979) is a shore-power circulation pump rated for about 14 gallons per minute at open flow. Pumps like this usually move seawater through a marine air conditioner, but they also suit closed hot-water loops and bait tank circulation. Centrifugal pumps favor steady flow over high pressure, which is exactly what a cooling loop needs.
Instead of a shaft passing through a seal, a magnet on the motor turns a second magnet on the impeller through a solid wall. With no shaft seal to wear, there is no seal drip to rust out the motor or wet the bilge. That design also lets the pump run around the clock while the air conditioning is on.
Centrifugal pumps are not self-priming, so mount this one below the waterline with a flooded intake and keep the sea strainer close and clean. It runs on 110V AC, so it must be wired through a properly rated breaker on the boat's AC panel. If flow drops, check the strainer and bleed any air trapped at the high point of the hose. 12V and 24V circulation pumps are also in our bilge and water pumps.
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