Rule Pumps 25D, Non-Automatic 500 GPH fully submersible 12 volt DC bilge pump offers many design features while keeping size and cost to a minimum. Especially popular on smaller craft, they are unmatched in pumping power and longevity. It features an easy clean snap lock strainer, silent and vibration less operation, anti-airlock protection, compact, efficient long life motor, marine grade blocked wiring, ignition protection, no burn-out when run dry and rust and corrosion protection.