2004DIN 16831-7:2004-02 Pipe fittings and joint assemblies for polybutene pressure pipes - Type PB 125 - Part 7: Dimensions of bushings, flanges and selaing elements for socket welding
2004DIN 16831-7:2004 Pipe fittings and joint assemblies for polybutene pressure pipes - Type PB 125 - Part 7: Dimensions of bushings, flanges and selaing elements for socket welding