... :PSL1-4,PR1-2 API 6A Wellhead Christmas Tree and Wellhead Equipment Features:1)API 6A Christmas ... & Wellhead Equipment 1. Fix drilled wellhead,connect wellhead casing string,seal and control the annular of casing,suspend tubing,control wellhead pressure and ... repairing5. Can be equipped with (pneumatic) hydraulic safety valve6. Working pressure : 2000psi20000psi Working medium : oil , natural gas , mud ...