Air Cut-Off Valve Sets are used to prevent afterburn generated by a lean fuel mixture when closing the throttle, by temporarily closing the slow-jet air passage, creating an instantly richer mixture.
Picture is the actual set that you will be receiving.
Note: Kit contains all needed parts for ONE carburetor! If you need more, you must purchase accordingly!
Set Includes Diaphragm and Spring (as seen in picture above)
NOTE: Requires FOUR kits to do all V-Four model carbs, or TWO kits for V-Twin model carbs!