The mechanical seal used in the RAP ACm150 centrifugal pump is a single spring-loaded mechanical seal designed to prevent water leakage along the pump shaft during operation. It typically consists of a carbon rotating face and a ceramic stationary seat, which work together to create a durable sealing surface that can withstand continuous friction and pressure. The seal is fitted on the pump shaft, usually around 16 mm in diameter, and is designed to maintain a tight seal while the motor drives the impeller. This type of mechanical seal is commonly used in centrifugal pumps because it offers reliable performance, good wear resistance, and effective protection of the motor and internal pump components from water ingress. It is suitable for clean water applications and contributes to the overall efficiency and longevity of the RAP ACm150 pump.