... consist of casing head, tubing head and Christmas tree, which are applicable for fixing ... well, sealing the annular space between casing and tubing, and hanging tubing string as well as adjusting ... tree is composed of valves and fittings can be used in oil, gas, water-injection and acid fracture, etc. ... psi ●Suitable Working Medium: Oil, natural gas, mud and water ●Rated Working Temperature: -46°C ~ 121° ...