... pipeline thread, tubing thread, butt-weld and compress-seal. The type mainly consists of: 100#, 200#, 206#, 207#,211#, 400#, ... connections of pipeline thread, tubing thread, butt-weld. Connections Type:Component Parts:Application: pipeline thread, tubing thread, butt-weld; ... gate valve, mud gate valve, chock valve, etc)3) Fitting(union, manifold,elbows), bop. API 6A Wellhead accessory- high pressure ...