... Certification:API 6A Application:oilfield equipment WP:High pressure API well head parts High-pressure union, importing international advanced technology, ... connections of pipeline thread, tubing thread, butt-weld and compress-seal. The type mainly consists of: 100#, 200#, 206#, ... thread, butt-weld;Nut, Male Sub, Female Sub, Seal Ring;oil field equipmentShanghai Jefa Machinery Co.,Ltd specialize in ...