... wellhead oil wellhead assembled of gauge bull plug, tree cap,threaded nipple,top connetctor,valves,cross and spoolNB:2-9/16 ... head, casing spool,tubing spool,tubing head adapter,studded cross, threaded flanges,adapter spool,gate valve,choke valve and the tree ... .rgdsYancheng Qihang Petroleum Machinery Co.,Ltd oil wellhead assembled of threaded nippe,solid bull plug,tree cap,cap flange,top connector ...