Xi'an ZZ Top Oil Tools Co.,Ltd is one of the top level wellhead christmas tree manufacturers and suppliers,Website:http://www. ... -Consist of casing head, tubing head and Christmas tree -Applicable to all the casing and tubing programs and connection types -Safe, ... be equipped with pneumatic (hydraulic) safety valve Specification of the X-tree Working pressure (psi) 2M, 3M, 5M, 10M, 15M, 20K ...