... Wellhead component Type:Octagonal,Oval and Groo Well head accessories API 6A gasket rings is widely used in petroleum, wellhead ... products,gate valve,flange,etc. StandardApplicationshapeAPI 6A,ISO 90012000,ISO9001 2008,ANSI etccasing head ... in API 6A products as below:1) Wellheads (casing/tubing head, crosses ,flange adapter,etc)2) Valve (FC/FLS ...