Design Features: Impellers - wide variety of metallurgic and elastomeric options (metal and elastomer interchangeable) pump out vanes on rear and front (on closed impellers) reduce recirculation within pump, and aid in preventing seal contamination optional castings of straight or semi-Francis vanes (from 3 to 8 vanes on certain sizes) offer wider hydraulic options in single sizes. Liners - wide variety of metallic and elastomeric options (metal and elastomer liners are interchangeable) to select from in order to provide the longest wear life possible. Bearing assembly - Cartridge-style bearing housing allows for removal from pump and assembly in controlled environment, Oversized shaft diameters and reduced overhang in the wet-end contribute to long life and reliability in the field. Seal arrangements - Expeller (Centrifugal Seal): no external sealing water required where applicable. Stuffing Box: flushed gland sealing with braided packing and a lantern ring. Mechanical Seals: advanced sealing technique without sealing leakage.