2018DIN 16961-2:2018 Thermoplastics pipes and fittings with profiled wall and smooth pipe inside - Part 2: Technical delivery specifications
2010DIN 16961-2:2010 Thermoplastics pipes and fittings with profiled wall and smooth pipe inside - Part 2: Technical delivery specifications
2000DIN 16961-2:2000 Pipes and fittings of thermoplastics materials with profiled wall and smooth pipe inside - Part 2: Technical delivery specifications