Dura-Line MicroDuct HDPE 27/20 — 27 mm nominal OD / 20 mm min ID microduct manufactured from flexible HDPE with internal longitudinal ribs and SILICORE® ULF inner lining to reduce coefficient of friction. Designed for underground and direct-burial applications (recommended thicker wall for DB), suitable for directional bore, plow, trench, microtrench and tray installations. Available in multiple colors and continuous lengths; typical safe working pull strength and bend radii shown in specifications.