Stainless Steel Flange, Pipe Fittings, Valve manufacturer / supplier in China, offering API 605 Nps 48" Pressure Testing En 1563 Necked Flat Welding Flange, En 1092-1 DN100 Pn25 Hazardous Environments Class B Necked Flat Welding Flange, En 1092-1 4 Inch Temporary Blockage ASTM B148 Necked Flat Welding Flange and so on.