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Graphite Spiral ?wound Gasket with inner ring and outer ring CGI.Spiral wound gasket (SWG) consists of a thin metallic strip and soft non-metallic filler that are simultaneously wound on a rotating mandrel. The metal hoop is pre-formed with a V or W shaped profile, which allows the gasket to act as a spring between the flanges. Further, the hoop provides the basic structural element for the gasket while the non-metal filler material seals small imperfections on the flange surfaces. Depend on its excellent compression resilientlink:http://www.gasket-china.com/gasket/spiral-wound-gasket/graphite-spiral-wound-gasket-with-inner-ring-and-o.html