Rule Pumps 14A, Non-Automatic 3700 GPH fully submersible 12 volt DC bilge pump is used by leading boat builders worldwide. Heavy duty construction for both commercial and pleasure boat use; known for trouble free operation and reliablilty. It features an easy clean snap lock strainer, silent and vibrationless 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