Johnson Pump Twin Port 1000 GPH Livewell Aerating Pump - 12V

The Johnson Pump Twin Port 1000 GPH Livewell Aerating Pump – 12V (part number 48903) is a dual-function marine water management system designed to feed both a livewell and raw-water washdown system from a single intake source. Operating at 1000 gallons per hour, this pump consolidates two separate supply needs into one compact, 12V DC powered unit—reducing plumbing complexity and system redundancy on small to mid-sized vessels where space and electrical budget are finite resources.

The pump features a 3/4" tapered inlet that connects directly to the through-hull sea cock, providing high-pressure inlet sealing adequate for sustained saltwater operation. The upper discharge port delivers continuous flow through a 3/4" outlet to the livewell, while the lower outlet port accepts either 1/2" or 3/4" barbed connections to route water to the washdown pump or deck-wash system. This configuration eliminates the need for multiple intake manifolds and reduces the overall footprint of the bilge and water-handling system—a critical consideration on boats where engine room real estate is limited and every cubic inch matters for accessibility and maintenance.

Operators running offshore fishing platforms, center consoles, and coastal work boats benefit from consolidating livewell aeration and freshwater rinse into a single 12V circuit. The 1000 GPH capacity is suited to livewells up to approximately 150 gallons and provides adequate deck-wash flow for light-to-moderate washdown duty. At 1 pound and compact dimensions (6 x 3 x 10 inches), the pump mounts easily beneath console or in the engine compartment without major structural modification. Marine environments—especially saltwater—demand robust inlet sealing and corrosion-resistant construction; Johnson Pump's engineering in this class reflects proven performance across commercial fishing and leisure boating sectors where reliability directly affects catch quality and vessel uptime.