. Many people have mentioned that the included funnel is too thick and may not fit and/or sit flush with the valve stem bore if the bore is countersunk/cased, even partially. I would heed that warning unless you want to squander $30. If the funnel is not flush with the valve stem bore, it becomes extremely difficult, if not impossible, to install or assemble the valve stem without crushing it. For reference, the outside diameter of the hopper at the outlet of the hopper, just before it tapersโฆ