National Tube Supply, 925 Central Ave, University Park, IL 60484, US

Allied Tube & Conduit is one of the largest business units of Tyco Electrical & Metal Products, comprising many of Tyco's leading brands and companies. Allied's Gatorshield galvanized steel tubing is a corrosion-resistant product used in various structural applications. The company s steel tube and pipe products include mechanical tubing, fence framework, sprinkler pipe and welded pipe fittings. The firm offers a complete line of metal and fiberglass cable tray systems, along with its center hung tray and wire basket tray. Its Century Tube subsidiary is a supplier of steel tube and pipe for Tier 1 and Tier 2 automotive suppliers, used in door impact beams. The company has been in business for more than 40 years, and serves mechanical tubing, fire sprinkler pipe and electrical conduit markets. Allied Tube & Conduit produces more than 400,000 tons of galvanized steel tubes every year, and is located in Harvey, Ill.