Dura-Line UL Listed HDPE is a flexible, non-metallic raceway used to protect underground cables and wires. It offers superior crush resistance, low coefficient of friction, and high tensile strength. Available in types Schedule 40, Schedule 80, and SDR 13.5; sizes from 1/2" to 6"; multiple color and striping options; sequentially marked footage. Conforms to NEMA TC-7 and is ETL tested to UL 651A. (Description compiled from distributor product pages.)