... 6A 2.Application:oilfield equipment 3.WP:High pressure Well head assembly(hammer union) High-pressure union, importing international advanced technology, is ... in API 6A products as following:1) Wellheads (casing/tubing head, crosses ,flange adapter,etc)2) Valve (FC/FLS gate valve ... , chock valve, etc)3) Fitting(union, manifold,elbows), bop. Well head assembly(hammer union)