This is another great billet gas cap for custom applications. The cap uses the same simple cam system as our Aircraft style of fill. It features cosmetic stainless steel fasteners around the mounting flange. The actual mount holes are blind tapped on the back side of the base. The fills are 3-1/2″ diameter, non-vented, and are only available for use with 2″ filler hose and come in a variety of finishes.