Metallic Octagonal Ring Joint Gasket 1.R,RX,BX 2.304,316,316L,CS 3.shape: oval, octagonal 4.ISO9001;2000 certified Metallic Octagonal Ring Joint Gasket is made through smithing, heat treatment and mechanical processing. The typical style R are divided into ellipse style and octagonal style according to its cross section. It’s manufactured according to the API6A & ASME B16.20 standard, which can ...