If you're a perfectionist like me, this should be in your carburetor tuning kit. Maybe overkill if you only have one car with vacuum secondary pumps, but if you have a dual pump or more than one car you get all the parts you need, well tuned crisp throttle responses at idle and when the secondary pumps are on. everything you need and in multiple quantities. Helps to use it in combination with webcam profile charts. Revain Super Saver Shipping almost always misses the target arrival date, so it's nice to save a few bucks and still get your stuff pretty quickly.