1. Type: R, BX, RX, IX 2. Shape: Octagonal, oval, lens 3. Standard: ASME B16.20 HG20612 HG20633 Product Description 1. ... Type: R, BX, RX, IX 2. Shape: Octagonal, oval, lens 3. Size: R11-105, RX20-215 BX150-303, inch 1 ... valve, oil&gas industry, oil christmas tree, wellhead assembly. Oval Ring Joint Gasket