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A DWC (Double Wall Corrugated) pipe is an underground pipe with a smooth inner wall and a corrugated, or wavy, outer wall. Made from high-density polyethylene (HDPE), the double-layered structure provides excellent strength and durability for applications like underground drainage, sewerage, and storm water systems. The smooth interior ensures efficient liquid flow while the corrugated exterior provides a strong, flexible, and lightweight structure capable of withstanding heavy loads from soil and traffic.