Master Landscape Supply Corrugated 8-Inch Pipe 20 ft.  - 8 in. x 20 ft. Polyethylene Corex Pipe helps transfer water collected from your roof's downspouts and other inlet points. The pipe features high-density, corrugated polyethylene. Construction to resist corrosion and abrasion. High-density polyethylene material is strong, durable and economical Use a 8" coupler to join pipe sections for longer runs Material resists corrosion and abrasion that can damage other types of pipe ...