Rule Non-Automatic Heavy Duty 3700 GPH Bilge Pump 14A This Rule 3700 GPH submersible bilge pump features heavy duty construction for both commercial and pleasure boat use and is known for trouble free operation and reliability. Rules line of submersible bilge pumps feature compact, efficient, long-life motors and easy-clean strainer bases. This standard bilge pump has a simple design, making it easy to install and service. The bilge pump features back flow prevention to reduce the amount of wate