Rule PWC 500 GPH Automatic Pump [25SA-6WC]PWC 500 GPH Automatic Pump In the next generation sensing bilge pumps, the 500 GPH S Series pump works on the principle of impeller resistance. 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". Improved design