The CNH series is made up of single-stage centrifugal pumps with self-priming device, axial suction port, open centrifugal impeller and independent shaft. The self-priming devices is made up of a helical rotor installed in front of the impeller and a rotor chamber which is off-centre in relation to the axis of the centrifugal stage. The series is made up of range of 2 models with open impeller, independent shaft and standard IEC motor. Mixed construction: pressed/cast stainless steel - AISI 316L (1.4404) - CF3M (1.4409). Investment casting and electrochemical polishing treatment guarantee excellent levels of surface finish.