Titan® type UL is manufactured with a spiral wound strip of heavy gauge, corrosion-resistant, hot dipped galvanized steel. For 3/8 in through 1-1/4 in trade sizes, the core is constructed with a square locked steel strip with an integral copper bonding strip enclosed within the steel convolutions. For 1-1/2 in through 4 in trade sizes, the core is constructed with a fully interlocked steel strip. A rugged, flame retardant, flexible PVC jacket is extruded over-the steel core. The gray jacket resists oils, mild acids and exposure to sunlight. Also available in other colors subject to minimum runs.