Rule 25S-Marine 500 Automatic Marine Bilge Pump Pump operates automatically by sensing for water, no external switch required, electronic sensing operation on the principle of impeller resistance More pumping capacity and more exclusive design features than any comparable competitive pump at a lower cost Power use in the checking mode is minimal Especially popular on smaller craft, Rule 500 pumps are unmatched in pumping power and longevity 1.9 amp draw; 2.5 amp fuse, 3/4 inch discharge, limited 3 year warranty