Dura-Line Smooth Wall HDPE conduit (smoothwall) is a flexible HDPE duct available in multiple wall thicknesses for applications including aerial, direct buried, and underground. Options include SILICORE® ULF permanently lubricated lining to reduce coefficient of friction for cable pulls. Available in multiple diameters and colors; sold in long continuous lengths on reels (600' reel option shown). Meets or exceeds common industry standards (ASTM, NEMA, UL, Bellcore).