Working Principle of centrifugal pump: The shape of the impeller transmits a radial motion to the fluid from the center out ward, with minimum hydraulic loss. The blades inside the impeller channel transfer energy to the fluid both in the form of pressure and an increase in speed. After leaving the impeller the fluid passes to the volute and tapered diffuser which transform part of the kinetic energy into pressure energy. With a single centrifugal impeller cantilevered on the motor shaft directly, the CPm series pumps have a compact size, extremely reliable, very simple to use and almost maintenance-free, particularly suitable for civil and industrial uses to pump clean water and chemically non-aggressive liquid. These pumps should be installed in a covered area, protected against the weather.