Aircraft style gas caps allow perfectly flush installation for that undisturbed, low profile look if motorcycle is viewed from the side. The lock ring can be screwed to the tank surface with the supplied lock nuts or by means of mounting ring kits which replace the nuts. These have to be ordered separately. For Aero 300 we also offer replacement caps (with keys) and weld-in bungs which allow gas cap installation without outer ring. The outer bolt cup and lock ring that come with each Aero cap are surplus with this set-up. Using the weld-in bungs you achieve the same look as with our ”Quick-Cam” tanks. Aero cas caps are of non-vented style. For proper tank ventilation a separate valve is required.