... ,ISO9001 Application:Wellhead component Type:Octagonal,Oval and Groo Sealing Ring Gasket (wellhead equipment) API 6A gasket rings is widely used ... in petroleum, wellhead products,gate valve,flange,etc. StandardApplicationshapeAPI 6A,ISO 90012000,ISO9001 2008,ANSI etccasing head ... , chock valve, etc)3) Fitting(union, manifold,elbows),bops. Sealing Ring Gasket (wellhead equipment)