Johnson Pump Cartridge Aerator 500 GPH Straight Intake - 12V

The Johnson Pump Cartridge Aerator 500 GPH Straight Intake – 12V (part number 28503) is a compact, high-flow bilge and circulation pump designed for marine and water management applications requiring reliable, continuous operation. Built to Johnson Pump's standards for dependable performance, this 500 GPH unit delivers steady throughput in confined spaces where footprint matters, making it a practical choice for vessel operators, fleet maintenance crews, and water system integrators who need proven pump technology without unnecessary bulk.

The 500 GPH capacity rating reflects the pump's output at standard operating conditions, suitable for mid-range bilge extraction, livewell circulation, or auxiliary water transfer tasks. The straight intake configuration positions the inlet port for direct, unobstructed water draw—a specification that simplifies plumbing runs and reduces pressure loss in systems where intake hose routing is straightforward. The Dura-Port discharge port provides a robust connection point engineered for durability in salt-air and corrosive marine environments. Rated 12V DC operation, this pump integrates seamlessly into standard marine electrical systems, battery banks, and vehicle auxiliary circuits. The cartridge design allows straightforward motor cartridge swaps in the field, reducing downtime when service is needed.

Operators choose this model when space constraints rule out larger units, particularly in center consoles, small craft, RVs, and auxiliary marine systems where a 500 GPH pump bridges the gap between minimal 12V options and 750+ GPH units. The compact profile accommodates installation in engine compartments, bilge cavities, and equipment lockers where installation flexibility is as important as performance. This pump is favored by maritime professionals, fishing fleet operators, and serious boaters who prioritize proven reliability and straightforward serviceability.