... equipment WP:High pressure API 6A high pressure union for wellhead High-pressure union, importing international advanced technology, is forged with ... Sub, Female Sub, Seal Ring;oil field equipmentShanghai Jefa Machinery Co.,Ltd specialize in API 6A products as following:1) Wellheads (casing ... gate valve, mud gate valve, chock valve, etc)3) Fitting(union, manifold,elbows), bop. API 6A high pressure ...