BOC 5TW-451 Manual BOC 5TW-451 and TW-452 Water-cooled Torches for Tig Welding. Instruction and Maintenance Manual with Parts as Exploded Component Drawings. Text in English, Francais, Deutch, Italiano and Espanol Manufacturers: BOC Models: 5TW-451 TW-452 Contents: Operators Manual Parts Manual