Corrugated & Smoothwall Cable Conduit is manufactured from High Density Polyethylene (HDPE) and is intended to be placed inside of existing innerduct. It's ideal for pulls under 1000 feet and is designed to reduce surface contact when pulling cable. Choose from our selection of corrugated duct, including high-temperature rigid metal duct hose, flexible duct hose, and more. This lightweight product offers maximum flexibility, and allows. ATEK Communications has in stock a complete Line of ETL verified Innerduct,Innerduct, 1" Innerduct, 2" Innerduct, Plenum Innerduct, Slit Duct, Split Duct, 3" Innerduct, Outside Plant Duct, Underground Vaults, plenum innerduct, fiber optic duct, conduit and raceway systems. Corrugated HDPE Premier. Plenum Innerduct a national stocking distributor of corugated innerduct and duct supplier who specializes in fast turnaraound for a complete line of corrugated innerduct and Plenum Rated Corrugated Innerduct and Raceway Products including custom lengths of Corrugated Innerduct, Corrugated Plenum. Duraline Smooth Wall HDPE Innerduct Conduit All Dura-Line's smooth wall conduit meets or exceeds one or more of the following standards: ASTM F-2160, ASTM D-3035, ASTM D-2239, ASTM D-3485, NEMA TC-7, UL 651, UL 1990, Bellcore GR-356 Features: Can be. Schedule 40, Schedule 80, SDR 13.