oil wellhead assembled of tree cap and gauge bull plug,threaded nipple NB:2-9/16" to 13-5/8 ... :14-140 Mpa wellhead oil wellhead assembled of gauge bull plug, tree cap,threaded nipple,top connetctor,valves,cross and spoolNB ... Co.,Ltd oil wellhead assembled of threaded nippe,solid bull plug,tree cap,cap flange,top connector, valves,cross and spool ...