Dura-Line Smooth Wall HDPE innerduct conduit. Meets or exceeds applicable standards (examples: ASTM F-2160, ASTM D-3035, ASTM D-2239, ASTM D-3485, NEMA TC-7, UL 651, UL 1990, Bellcore GR-356). Co-extruded with SILICORE® ULF lining for ultra-low friction, suitable as innerduct or outer conduit, available in continuous long reels to reduce joins. Typical installation methods include direct burial, direct bore, HDD, aerial, trench, tray, and plow.