The ShinMaywa Norus Series submersible pumps are some of the most reliable and durable pumps sold today. On the outsideit has a unique corrosion resistant hardware design made of stainless steel and poly amide fiber reinforced resin. In addition, it features a castaluminum bearing housing, and a vibration reducing bearing design which provides superior heat dissipation and structural integrity in comparison tocompeting pumps. The Norus series pumps are the most reliable, highest efficiency, lowest lifetime cost of any pump in its class.