Metal gasket with inner and outer rings is composed of a basic metal gasket wrapped with a steel plate 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 different materials. There are four types of metal gaskets: 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 flange connections in pipelines, valves, pressure vessels, condensers, heat exchangers, towers, manholes, handholes, and other equipment in the oil, chemical, metallurgical, power, shipbuilding, and machinery industries.