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12" X 20' length perferated with bell coupler. HDPE Pipe. A corrugated outer wall molded to a smooth inner wall for tremendous strength and durability, while maintaining a light weight. The smooth interior allows for a Manning0s 0n0 design value of 0.012 for exceptional hydraulic efficiency over alternative types of pipe. With its superior abrasion and corrosion resistance, it is a superb alternative to concrete and metal pipe in commercial drainage systems. Made in USA.