Overview

The Jabsco 436981 is a magnetic-drive centrifugal pump for continuous-duty circulation jobs that need steady flow without a shaft seal. It runs on 110V AC at 60Hz, moves up to 21 GPM in open flow, and uses 3/4 inch NPT ports, which makes it a practical fit for marine air conditioning loops, ice makers, hot water recirculation, and livewell or bait tank systems on boats with an AC supply.

The pump head is entirely non-metallic and built from chemical-resistant thermoplastics, which helps in installations where corrosion is a concern. This model is rated for an 18 foot head and uses a fan-cooled motor with ignition and thermal protection. Overall size is about 8.6 inches long, 5.62 inches high, and 4 inches wide, with a listed weight of 6.83 lb.

Key features

• Magnetic-drive layout for leak-free circulation without a conventional shaft seal
• 110V AC, 60Hz motor for boats with shore power, generator power, or an AC distribution system already in place
• Open flow up to 21 GPM with a listed head of 18 feet
• 3/4 inch NPT ports for straightforward plumbing into common circulation systems
• Non-metallic pump head in chemical-resistant thermoplastics where metal contact at the wet end is not wanted
• UL-listed motor with ignition protection, thermal protection, and fan cooling
• IPX5 motor housing for installations that may see spray or washdown, while still needing sensible placement away from direct flooding

Installation and setup

This pump suits fixed plumbing where continuous circulation matters more than portable transfer. The 3/4 inch NPT ports make hose barb or threaded adapter selection straightforward, and the compact body helps when the pump needs to sit near an air conditioning loop, water heater circuit, or bait system plumbing. Leave room around the motor for ventilation and routine access.

Because this is a 110V AC pump, it belongs in boats that already have an AC electrical setup. Listed current draw is 1.4A with a 1.5A fuse, so it should be matched to a circuit built for that load and the marine environment around it.

Compatibility and fit

This model is a good match when you need an AC circulation pump rather than a 12V or 24V DC pressure pump. It works best in systems built around continuous flow, including marine air conditioning circulation, ice maker supply circulation, hot water recirculation, or livewell and bait tank installations that call for a sealed magnetic-drive pump. The non-metallic wet end also makes sense in spaces where corrosion resistance matters and where the pumped fluid and plumbing are compatible with thermoplastic components.