Rule 500GPH Standard Bilge Pump - 12V

The Rule 500GPH Standard Bilge Pump – 12V (MPN 25DA) is engineered to move water out of your bilge quickly and efficiently at the voltage levels your boat actually operates at. Unlike earlier generations requiring 13.6V, this next-generation pump delivers its full 500 gallons-per-hour flow rating at 12V—matching typical onboard electrical supply. That engineering distinction matters: it means faster activation and more consistent performance across the full discharge cycle, which translates to better water management when it counts.

The 500GPH capacity handles moderate bilge water accumulation in boats ranging from center consoles to cabin cruisers without the energy draw of larger displacement pumps. Rule integrated a check valve into this design to prevent backflow when the pump is idle—a standard feature in modern bilge systems. The pump also incorporates a hidden air vent positioned under the strainer tabs to prevent airlocking, a common failure point in sealed bilge designs. The strainer intake and internal passages are engineered to remain clear during extended operation, reducing maintenance intervals on recreational and fishing vessels.

This pump is sized for weekend fishermen and serious anglers operating vessels where automatic bilge activation is either manual or tied to a float switch. The 12V DC configuration makes it compatible with standard marine battery banks and existing electrical systems without requiring voltage regulators or converters. Weighing 0.8 lbs and occupying minimal bilge space (7 x 4 x 7 inches), it installs easily in confined quarters. Whether you're running inshore or working offshore, consistent water removal is non-negotiable—this pump handles that responsibility without drawing excessive amperage from your battery or charging system.