... 6A Oval rings joint gasket API 6A gasket rings is widely used in petroleum, wellhead products,gate valve,flange,etc. StandardApplicationshapeAPI ... 6A,ISO 90012000,ISO9001 2008,ANSI etccasing head,flange, gate valve, oil&gas industry, oil christmas tree, ... products as below:1) Wellheads (casing/tubing head, crosses ,flange adapter,etc)2) Valve (FC/FLS gate valve, mud gate ...