pipe and fitting 1.American standard: Material: ASTM A-197 Dimension: ASME B16.39 Galvanization:ASTM A153 Threads:ANSI B1.20.1 Size:1/8 to 4 2. Hot dipped galvaznized using the first class zinc,normal black and shinning black. 3.. excellent raw materials 4. leakage test one by one 5. precise angles 6. good antirust property 7. strong package