Union ElbowMaterial SpecificationC360 (Free Cutting Brass)-Forging Grade, IS 319, others as per requirement StandardsASTM, ASM, DIN Types of Tube SizesMetric, Imperial Thread StandardsBSP, UNEF UsesCopper Tubes, Brass Tubes, Aluminum Tube, Steel Tube ApplicationPlumbing SizeMetric 4 MM to 32 MM, Imperial 1/8” to 1.1/4”