DIN 16831 Pipe fittings and joint assemblies for polybutene pressure pipes - Type PB 125 - Part 7: Dimensions of bushings, flanges and selaing elements for socket welding*, 2004-02-01 Update
DIN 16962 Pipe joint assemblies and fittings for types 1 and 2 polypropylene (PP) pressure pipes; injection moulded reducers and nipples for socket welding; dimensions
DIN 16963 Pipe Joints and Elements for High Density Polyethylene (HDPE) Pressure Pipelines, Types 1 and 2; Injection Moulded Tee Pieces for Socket-welding, Dimensions