The two main features of the horizontal multi-stage pump CM (=centrifugal module) are compact structure and modular design, allowing for multiple configurations. The pump is essentially composed of a series of interchangeable modules that seamlessly connect to each other in any application. This series of pumps is coaxial. The difference between CM pump and CME pump is reflected in the motor. The CM pump uses AC electric power, while the CME motor is equipped with an integrated frequency converter. Both CM and CME pumps are equipped with mechanical shaft seals.