1.shape: Octagonal, Oval 2.type: R,BX,RX 3.size: R11-105,RX20- ... 6A, ISO9001:2000 , AZ Ring joint gasket oval1.shape: Octagonal, Oval or lens2.type: R,BX,RX3.size: R11-105,RX20 ... iron, inconel600, M-400, C-276, and so on8. Application: W/N flange, gate valve, oil&gas industry, oil christmas tree ... Standard and meet our customer's demands. ASME B16.20 OVAL WELLHEAD RING JOINT GASKET