Dura-Line smoothwall HDPE conduit (1.25" / 1 1/4" SDR‑11) is a flexible HDPE conduit available with a co‑extruded SILICORE® ULF low‑friction interior lining for extended cable pulls and jetting. It is used as innerduct or outer conduit for telecom, electrical and utility installations, suitable for direct burial, HDD, bore, aerial and tray installations. Distributor listings show variants with tracer wire, with or without tape, multiple reel putups (commonly 2,500'–8,500' depending on SKU), and colors including orange and black. Manufacturer technical datasheets for CoExtruded 1 1/4" SDR 11 and SILICORE ULF are available from Dura-Line.