STIPL - Double Wall Corrugated (DWC) Pipe Duct has the following application in Telecom & Electrical Networks :- Telecom lt used as the main duct in main-duct sub-duct network design. Protection of ducts and optics fiber cables in city networks. Casing of all type copper aluminium, armored and un-armored cables. Used as a casing duct for simultaneous placement of quad cables and optic fiber cables along railway tracks.