... the drilling well, sealing the annular space between casing and tubing, and hanging tubing string as well as adjusting the flow rate ... . Christmas tree is composed of valves and fittings can be used in oil, gas, water-injection and acid fracture, etc. ●Rated Working ... Pressure: 2,000 psi thru 20,000 psi ●Suitable Working Medium: Oil, natural gas, mud and ...