... and Grooved API 6A gasket rings for wellhead API 6A gasket rings is widely used in petroleum, wellhead products,gate valve,flange,etc. StandardApplicationshapeAPI 6A,ISO 90012000 ... adapter,etc)2) Valve (FC/FLS gate valve, mud gate valve, chock valve, etc)3) Fitting(union, manifold,elbows),bops. API 6A gasket rings for wellhead