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RX Type ring joint gaskets are manufactured to fit the API 6B flange"s groove,interchangeable with R(oval) and R(octagonal) series,bear pressure can reach to 15000 PSI,so these gaskets performance excellent in 6B flange, suitable to the higher pressures with higher vibrations and heavier weights of these units.link:http://www.gasket-china.com/gasket/ring-joint-gasket/chemical-flat-ring-bx-ring-joint-gasket.html