Definition of DC bilge pump: Micro Bilge Pump (Bilge Pump) is also called micro submersible Pump, "micro DC submersible Pump", "12V micro submersible Pump" and so on. It is often referred to as a "DC bilge pump" because it is powered by DC. It is usually put in the bilge of ships such as cruise ships and fishing boats to remove the bilge water in time. Can also be used for fish tank water/water cycle/agricultural watering flowers and sprinkling water. It's usually put in water, completely or partially submerged. Usually 12V or 24V DC power supply, Marine battery and other power supply. Note: when working, the positive electrode of the battery is connected with the brown wire, the negative electrode is connected with the blue wire, and the customer with insufficient wire can connect 1 square wire by himself.