API 6A Oval rings joint gasket: Standard:API 6A,ISO9001 Application:Wellhead ... :Octagonal,Oval and Groo API 6A Oval rings joint gasket API 6A gasket rings is widely used ... 2008,ANSI etccasing head,flange, gate valve, oil&gas industry, oil christmas tree,wellhead assembly,petrochemical industry,oil ... below:1) Wellheads (casing/tubing head, crosses ,flange adapter,etc)2) Valve (FC/FLS gate valve, mud gate ...