Dura-Line MicroDuct (8.5 mm OD / 6 mm ID) locatable riser microduct with SILICORE® ultra-low friction co-extruded inner lining. Riser-rated (Durathane) HDPE construction with straight internal ribs; available empty or with optional 50# pull string or pre-installed fiber/pull cord. Designed for MDU and riser installations; distributor listings note ETL listing to UL-2024 and CSA C22.2 No.262-04 and UL-94 V-0 / CSA FT-4 flammability performance. Manufacturer technical data sheet provides dimensional specs (OD/ID, min ID, oversheath, height, width, weight, bend radii, SWPS) and installation guidance (recommended fill ratio 50%–75%).