... includes all of the above tubing head flange equipment. Christmas tree assemblies can be applied to many different combinations to meet ... gas, H2S, CO2 and other corrosive media, and thus gas tree seal and the material should have more stringent requirements. Sometimes ... , natural gas, mud, containing H2S, CO2 gasOperating temperature: -46 °C ~ 121 °C (LU level)Material Level: AA, BB, CC, DD, EE, ...