This series are open impeller centrifugal submersible drainage pumps, designed to function either partly or totally submerged. the impeller, mounted on the end of the drive shaft, consists of a back disk and blades. The fluid enters the rotating blade channel via the suction strainer, where it moves radially from the centre outwards, acquiring energy both in the form of pressure and increased speed. when it leaves the impeller the fluid is conveyed into the volute. Here part of kinetic energy is transformed into pressure energy and the fluid leaves the pump via the side of delivery opening in the pump body. correct motor cooling is ensured by the fluid being pumped.