Stainless Steel Pipe Fitting, Union, Conical or Flat Seat, Threaded. Materials: WCB, SS316,SS304, CF3, CF3M, CF8, CF8M, C5, 304L, 316L Standard:API6D, DIN, JIS, ANSI, BS, MSS-SP114,ect... Inspection and test: API6D, BS6755.