... api pass fty natural gas wellhead consisits of threaded flange,gate valve,studded cross ,adapter spoolNB:2-9/16" 3-1 ... spool,tubing head adapter,studded cross, threaded flanges,adapter spool,gate valve,choke valve and the tree cap. All wellhead tree ... and life ! B.rgdsYancheng Qihang Petroleum Machinery Co.,Ltd natural gas wellhead consisits of threaded flange,gate valve,studded cross ,adapter spool