Chesterton 255-21/65M Centrifugal Pump Center Section Cartridge Flanged Housing

Chesterton Pump Cartridge 255-21/65M.  Cartridge is in clean condition, may be unused but we don't know for sure.
1/2" ports.
48mm shaft dia.
16.8" Flange OD.  427mm.
Motor end shaft has a 7" Dia mounting adapter plate.
27" Overall length.