Bilge Pumps
A bilge pump removes water that collects in the lowest part of the hull. Most boats use an electric submersible pump with either a separate float switch or a built-in automatic sensor, wired so it can run even when the main battery switch is off.
Rated flow (GPH) is measured at zero head, so real-world output is lower once you add lift height, hose length and voltage drop. See our bilge pump sizing guide for how to pick capacity and wire it.
Browse 287 bilge pumps products in Marine Plumbing & Ventilation, 236 in stock and ready to ship from NJ and FL. Top brands include Rule, Johnson Pump, Whale Marine and Attwood Marine. Prices range from $9.99 to $828.16. Filter by brand, price or availability, or search by manufacturer part number or UPC.
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Bilge Pumps FAQ
Automatic or manual bilge pump?
Most boats benefit from an automatic pump (built-in sensor or a separate float switch) plus a manual override switch at the helm. That way the pump runs if the boat takes on water while you're away, and you can test it on demand.
Why doesn't my pump move its rated GPH?
Ratings are measured with no lift and at full voltage. Lift height, long or narrow hose, check valves and voltage drop in undersized wiring all reduce actual flow.
Should I add a second bilge pump?
Many owners add a higher-capacity backup pump mounted slightly above the primary, often with a high-water alarm, so a second pump starts if the first can't keep up or fails.
How do I keep a bilge pump reliable?
Keep the bilge clean of debris, test the float switch regularly, check connections for corrosion and use properly sized, tinned wire with heat-shrink connections.