Metal gasket with inner and outer rings is composed of a basic metal gasket wrapped with a steel plate ring to form the inner and outer rings. The outer ring is used to reinforce pressure and prevent loosening of the wrap. The outer ring is available in various materials. Metal gaskets come in four types: Basic Metal Gasket (HOTA-600A), Metal Gasket with Inner Ring (NOTA-600B), Metal Gasket with Outer Ring (HOTA-600C), and Metal Gasket with Inner and Outer Rings (KOTA-600D). Application range: Sealing for pipelines, valves, pressure vessels, condensers, heat exchangers, towers, manholes, handholes, and other flange connections in industries such as oil, chemical, metallurgy, power, shipping, and machinery.