Advantages : Material : The improved material, Ni-Al-Bronze, is used for pump casing and impeller. Mechanical properties and corrosion resistance is higher than bronze casting. Life time of casing is long. Easy Maintenance for Cartridge Type M/Seal : The cartridge-type mechanical seal facilitates easy maintenance. Improvement of Hydraulic Performance : Adoption of high efficiency discharge volute, high performance suction volute and wear ring configuration.