... ISO 15875, ISO 15876 and ISO21003, among others. The manufacturing system is certified ISO 9001 by DQS of Germany (IQnet)1 ... ,0 16,31,8 1,8 2,120 20,0 20,31,9 1,9 2,220 20,0 20.32,8 2.8 3.225 25 ... ,0 25,32,3 2,3 2,725 25,0 ... ,0 25,32,5 2,3 2,926 26,0 26,33 2,8 3,432 32,0 32,33 2,8 3,43. Copper pipes ...