... gauge bull plug, tree cap,threaded nipple,top connetctor,valves,cross and spoolNB:2-9/16" 3-1/16" etc wellhead ... casing head, casing spool,tubing spool,tubing head adapter,studded cross, threaded flanges,adapter spool,gate valve,choke valve and the ... good business and life ! B.rgdsYancheng Qihang Petroleum Machinery Co.,Ltd oil wellhead assembled of threaded nippe,solid bull plug,tree ...