Rule Non-Automatic 800 GPH Bilge Pump 20DA Rule non-automatic bilge pumps pumps deliver ultimate pumping performance in an easy-to-install pump. It has an optimized impeller to provide great flow at the same amperage. This bilge pump features back flow prevention to reduce the amount of water left over in the bilge. This reduces odor and helps keep the bilge cleaner. Hidden air vents within the body help prevent air locking in challenging plumbing installations and helps with the check valve. Th