Three-Socket Cross, Three Socket Cross, For Pipe Size 1 in, Corrosion Resistant Yes, Cast Iron, Gray, Zinc-Plated, For Actual Pipe Outer Diameter 1 3/8 in, Overall Length 3 5/8 in, Pipe, Inside Diameter 1 3/8 in, ASTM A 47, ASTM A53, ASTM B117 Galvanized and manufactured per international standards for durability and corrosion resistance. Features quality set screws with antirust coating. Fittings build with no welding required; pipe cutters and a standard hex tool are usually the only tools needed. Use No. 30LX45 screws, sold separately.