Dura-Line Smoothwall HDPE conduit (2" SDR 11) — flexible HDPE conduit/innerduct for underground or aerial use. Smooth inner and outer walls; options include SILICORE® ULF co-extruded lining (ultra-low friction), factory pre-installed Bull-Line™ pull tape (various tensile strengths and locatable options), and factory pre-installed cable. Meets or exceeds common standards such as ASTM F-2160, ASTM D-3350, ASTM D-3485, NEMA TC-7, UL 651A, UL 1990 and Bellcore GR-356. Typical installation methods: plow, trench, directional bore, direct burial, tray, aerial.