... .,Ltd is one of the top level wellhead christmas tree manufacturers and suppliers,Website:http://www.zztopdownhole.com ... wellhead x-tree, welcome to contact us. Introduction Christmas trees /X-tree as per API 6A , both ... 6A -Consist of casing head, tubing head and Christmas tree -Applicable to all the casing and tubing ... , 5M, 10M, 15M, 20K Material class AA, BB, CC, DD, EE, FF Working temp. L, P, R, S ...