The Duraline HDPE Innerduct, 5 in, SDR 13.5, 500 ft, Smooth Wall, Black (vendor part 2025265120, Millennium part 521672), gives conduit crews a low-friction path for pulling or blowing larger fiber cable bundles into an existing duct system. Its smooth wall reduces drag during cable placement compared to corrugated innerduct, and the SDR 13.5 wall rating holds up to standard buried and directional bore installations. The 500-foot put-up matches typical reel handling for OSP fiber crews. Order it alongside couplers and duct plugs sized for 5-inch HDPE duct runs.