... Tools Co.,Ltd is one of the top level wellhead christmas tree manufacturers and suppliers,Website:http://www.zztopdownhole.com, with ... API 6A -Consist of casing head, tubing head and Christmas tree -Applicable to all the casing and tubing programs and connection ... PR1, PR2 Master bore (in) 2-1/16, 2-9/16, 3-1/16(3-1/8), 4-1/16 Pass-by bore ... (in) 2-1/16, 2-9/16, 3-1/16 ...