Check the listing for details. Rule 500 GPH Bilge Pump 25DA. Condition: New. Listed at 32.99 USD. Rule 500 GPH Bilge Pump 25DA The Rule 25DA 500 GPH non-automatic, fully submersible 12V DC bilge pump provides outstanding quality and value. The bilge pump is designed with a small hole underneath the strainer tab that acts as an air vent to prevent air-locking. Protected against rust and corrosion, the pump is constructed with a stainless steel shaft, nylon impeller, and marine-grade blocked wiring. It is economically priced and designed for small boats. Compact bilge pump features silent and vibration-less operation, efficient long life motor, and ignition protection. Will not burn out after running dry Submersible Ignition Protected Non-Automatic (used with a panel switch or Rule float switch) High Efficiency, Low Amp Motor Stainless Steel Shaft Non Burn-out When Dry Included Back Flow Preventer 12V DC 1.6 Amps 4A Fuse Required (not included) Port size is 3/4"