Plastic double-wall corrugated pipe 1...Lift time:50years 2.ISO,OHSAS18001 3,.Easy to install Plastic double-wall corrugated pipe1.As a ... main products include PVC-U, PP-R, and PE pipes and fittings, PVC-U windows and doors, telecommunication ducts, PE fuel gas, ... crack under stress•Good anti-friction performance,high corrosion and aging resistance,with long lifetime.•Good flexibility•Small flowing ...