free delivery on orders over £50!  Home > Water Pumps and Fittings > Rule Pumps > Automatic Submersible Bilge Pumps Search Our New Site TotalBoatCare.com department Home Page Boat Maintenance Book Shop Clymer Repair Manuals Dinghies and Accessories Electrical Equipment Fenders and Buoys Galley Equipment General Chandlery Marine Electronics Outboard and Motorboat Fittings PWC/Jet Ski Equipment Safety Equipment Special Offers Vetus Marine Equipment Water Pumps and Fittings Watersports sections Clips and Hoses Rule Pumps Whale Pumps sub-sections Automatic Submersible Bilge Pumps Bilge Pumps Float and Panel Switches Automatic Submersible Bilge Pumps Computerized operation on the principle of impeller resistance. Float switches are not required. The pump will turn on every 2-1/2 minutes for about one second to sense for water. If water is present, the pump will sense resistance and continue to run until all water is remove. Thereafter, it will check for water every 2-1/2 minutes. Power use in the checking mode is minimal. clicking on a product will take you to TotalBoatCare.com a brand new site designed to offer you a better service and more choice Items 1 thru 7 (of 7) Rule Mate 500 Rule Mate 750 Rule Mate 1100 Rule 500 GPH Computerised Pump Rule 1100 GPH Computerised Pump Rule 2000 GPH Computerised Pump Rule Shower Sump System - 98 Items 1 thru 7 (of 7)