Abstract: An automatic emergency bilge water pumpout system. The system comprises a through-hull water intake pipe for a boat engine's cooling water pump and a valve for closing the intake of water through the through-hull intake pipe. Another emergency pipe for aspirating water from the interior of a boat bilge communicates with a part in the valve. Float for automatically closing off the flow of water through the through-hull intake pipe and simultaneously opening the valve's part to the other emergency pipe, for pumping out the boat's bilge when water reaches a dangerous level are provided.