The main characteristic of the electric pumps with semi-axial impellers is to give high deliveries with low heads. The impeller and the deflector shell are made of new technology, American high-tech composite plastic materials and stainless steel. The coupling Pump-motor is according to NEMA regulations. Parameter Demension MaterialAC Solar Pump With Plastic Impeller website:http://www.sincrea-solar.com/solar-pump/ac-solar-pump-with-plastic-impeller/