1.Elbow, Equal Tee, Concentric Reducer,etc 2.Standards:GB, DIN, ASTM, ANSI, JS 3.Best Quality 4.Good ... SUS316,SUS316L,SUS316Ti,SUS317L,SUS321,SUS321H...DIN:1.4301,1.4306,1.4401,1.4435,1.4571,1.4436,1.4438,1.4541...GB:0Cr18N9,00Cr19Ni10,0Cr17Ni12Mo2, ... SUS316,SUS316L,SUS316Ti,SUS317L,SUS321,SUS321H...DIN:1.4301,1.4306,1.4401,1.4435,1.4571,1.4436,1.4438,1.4541...GB:0Cr18N9,00Cr19Ni10,0Cr17Ni12Mo2, ...