... →storage.Product DescriptionMaterial: PE80/ PE100 (now we mainly use pe 100).Sizes: 20mm--630mmSDR: SDR11,SDR13.6,SDR17 ... flanged jointedStandard: GB/T 13663-2000 Certification: ISO9001Application: Water supply, Industries liquids transportation , sewage conduit,Air conditioner ... of the whole engineering,6.Smooth interior wall, small water resistance, high flow capacity,7.Long service life :up ...