... 3.strong making ability spiral wound gasket with inner ring and outer ring Spiral wound gasket with inner ring/centering ringThe spiral wound gasket ... 60'' DN10 to DN1500Gasket type: basic type, with outer/cantering ring type/ with inner ring type/ with inner & outer ring Ring material: CS plated zinc ... -asbestosStandard: ASME,ASNI,JIS, JPI, ISO, DN spiral wound gasket with inner ring and outer ring