The LTGUS04G-J is a general-purpose, UL Listed liquid-tight flexible metallic conduit providing premierperformance in the toughest applications. The core is made of galvanized steel with a PVC (Polyvinyl Chloride) extruded smooth jacket in gray color. Conduit size 1 Inch (27mm), coil length in a standard reel 120 meters (400 feet), working temperature -30 to 80°C. The inside diameter is 1.041 (26.4mm) and the outside diameter is 1.315 Inch (33.4mm). Used extensively in the machine tool and other industrial environments where flexibility is necessary for motion, vibration and bending. Listed and marked for direct burial in earth or in poured concrete.