API 16A Annular Bop, Mud Gate Valve, Plug Valve manufacturer / supplier in China, offering API 6A H2 Type Manual Adjustable Choke Valve for Drilling Manifold, High Quality Annular Bop Forged Mining Machine Parts for Well Drilling & Use in Drill Tools, API Spec 6A Cross Assembly All Studded 4 Ways with Gasket and so on.