Gate Valve stem 2)4"API JIS Gate Valve 3)Checked by Go & No go gage 4)Surface ... Polishment and NDT Test 5)ISO9001:2 Gate Valve StemsStandard: ASTM, BF,BS, JIS, UNI, ANSI, ISO etc ... Steel, Alloy Steel, Ductile Iron, Grey Iron, Copper, Aluminum Bronze, Malleable Iron etc.2) Process: Investment Casting, Sand Casting (Resin ... can be made before packing. JIS API lengthening Gate Valve Stem