Standard:JIS, ASME, DIN ,GB and so on. Material:304, 304L,316, 316L, A105, F11, F22 and so on. 1) Standard: JIS, ASME, DIN ,GB, HG and so on. 2) Materials (stainless steel) include:1.4301, 1.4306, 1.4401, 1.4404, 1.4541SUS F304, SUS F304L, SUSF316, SUSF316L, SUS F321ASME F304, ASME F304L, ASME F316,ASME F316L,ASME F321 and so on.3) Sealing Surface: FF, RF, LJ, TG, FM, and R.T.J. Etc welding neck ...