Rule 1100 GPH Electronic Sensing Bilge Pump - 24V. 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 removed. After that it will resume checking for water every 2-1/2 minutes. Water is kept in check between 1/8" and 3/8" Great idea when power conservation is needed and as an added benefit no float switch is needed All that plus the added benefits of our standard bilge pump: Check valve included with hidden air vent to prevent airlocking True electromagnetic suppression (EMC) A built-in thermal cell that protects the pump and the vessel when things get too hot These are the smallest automatic pumps available on the market Specifications for Rule 1100 GPH Electronic Sensing Bilge Pump: Manufacturer: Rule Color: Black Voltage: 24 volts Features of Rule 1100 GPH Electronic Sensing Bilge Pump Completely automatic with manual override - No Float Switch Needed Submersible and Ignition Protected High efficiency low amp motor Stainless-steel shaft Includes backflow preventer Package Contents: Rule 1100 GPH Electronic Sensing Bilge Pump Rule 27SA-24: 1100 GPH Electronic Sensing Bilge Pump - 24V