... connections of pipeline thread, tubing thread, butt-weld and compress-seal. The type mainly consists of: 100#, 200#, 206#, 207#, ... 602#, 1002#, 1003#, 1502# and 2002#. It is an important part for transporting oil. Water, fracturing fluid and mixed fluid . These ... thread, tubing thread, butt-weld;Nut, Male Sub, Female Sub, Seal Ring;oil field equipmentShanghai Jefa Machinery Co.,Ltd specialize in API ...