Definition: Micro bilge pump (Bilge Pump) also known as micro-submersible pump, micro-DC submersible pump, 12V micro-submersible pumps and so on. Usually placed on the bilge of ships, fishing vessels and other bilges, and timely exclude bilge water use. Usually into the water, all or part of the submerged. Usually 12V or 24V DC power supply, marine batteries and other power supply. Working principle: There is an impeller inside the micro bilge pump, which is rotated at high speed after electrifying. The water in the vicinity of the impeller is quickly thrown out to form a vacuum (negative pressure) near the impeller. The pressure in the outside atmosphere and the pressure in the vacuum chamber are different, The submersible pump near the water through the inlet (often the bottom of the submersible pump many mesh) into the submersible pump, and then thrown out, while the external water is sucked in ........ With the float switch, Can be in the bottom of the water to the warning water level automatic micro-submersible pump drainage; water level dropped to the warning low automatically cut off the power to micro-submersible pump down to avoid dry.