Steel Reinforced Spirally Wound HDPE Drainage Pipe DN200-DN2600, SN8 SN10 SN12.5 Standard: CJ/T270-2007 ... ISO9001:2008 &ISO1400 Steel Reinforced Spirally Wound HDPE Drainage PipeFeatures ... as rain pipe of buildings, underground drainage pipe, blow-off pipe, vent pipe, etc.5. Dirty water collecting pipe in refuse landfills.6.Large-scale port ...