... ,BX,RX 3.size: R11-105,RX20-215 BX150-303 Christmas Tree" Wellhead Sealing1.shape: Octagonal, Oval or lens2.type: R ... iron, inconel600, M-400, C-276, and so on8. Application: W/N flange, gate valve, oil&gas industry, oil christmas tree, wellhead ... API Standard and meet our customer's demands. Standard/Unstandard "Christmas Tree" Wellhead Sealing