The WO series submersible sewage pump is mainly composed of three parts: motor, seal, and pump body. The motor is located at the upper part of the pump and is divided into single-phase and three-phase asynchronous motors (low-voltage motor and high- voltage motor). A double end mechanical seal is used between the motor and the pump body, and an "O" - shaped front oil rubber seal ring is used for static sealing at each nationally designated sealing point. This series of submersible pumps has the characteristics of compact structure, high flow rate, high efficiency, and easy use. The mechanical seals in key parts are made of hard alloy and high-quality silicon carbide, which have good anti-corrosion, leak proof, and durable characteristics.