L,,,KMA,
Rick would you not say that depending on what the pressure was when you took a pull had something to do with this though, depending on how the actual hole was made in the top cap, a smaller hole where the drip tip goes down into would create more pressure and pull in the inside of the cap ? where a bigger hole would have less pressure, thus it would change how all this could work depending on the final design, and whether a bigger or smaller top cap was made it would and could change on how much air intake was happening depending on the pull, and how those holes are made, there is a bit involved here and more that meets the eye Rick