Plastic double-wall corrugated pipe 1,,Lift time:50years 2.ISO,OHSAS18001 3,.Easy to install Plastic double-wall corrugated pipe1.As a company listed ... . Our main products include PVC-U, PP-R, and PE pipes and fittings, PVC-U windows and doors, telecommunication ducts ... , PE fuel gas, etc.2.Specification: Inside diameter(mm)Outside ...