Drag Specialties Pop-Up Low-Profile Gas Cap For Harley Billet aluminum construction that is available in a polished chrome or wrinkle black finish. The fit is nearly flush when closed and then it opens easily with just a quarter-turn of the center of cap. Features: Available vented, non-vented or in a dummy cap version 2.36 outside diameter Sold each Cap Styles: Vented cap has right-hand threads and is usually used on gas tanks with one cap or on the right side of tanks with two caps Non-vented cap has left-hand threads and is usually only used on the left side of tanks with two caps Dummy cap snaps into place and is usually only used to replace a left side LED gas cap