Dura-Line smooth wall HDPE innerduct conduit manufactured from flexible HDPE; meets or exceeds standards such as ASTM F-2160, ASTM D-3035, ASTM D-2239, ASTM D-3485, NEMA TC-7, UL 651, UL 1990, Bellcore GR-356. Co-extruded SILICORE® ULF lining available; continuous long reels; suitable for directional bore, plow, direct burial, HDD, aerial, tray installations.