Schedule 40 UL-listed HDPE conduit (smoothwall) from Dura-Line designed for underground cable protection. Available in multiple schedules (SCH 40, SCH 80, SDR 13.5) and sizes; manufactured from flexible HDPE for gradual bends, with strong crush resistance, low friction and high tensile strength. Conforms to NEMA TC-7 and is ETL tested to UL 651A. (Product information compiled from distributor product pages and manufacturer technical datasheet references.)