Rule Pump Inline 500Gph SubmersibleRule 500 GPH Inline Submersible Pump Versatile non automatic submersible pump designed for bilge, livewell, washdown, and general utility applications where manual control is preferred. Key Features: 500 gallons per hour pumping capacity Non automatic operation for manual control 12V DC operation for standard marine electrical systems Inline design with 3 4" inlet and outlet ports Fully submersible construction Compact footprint for flexible