OK, here is another one Ive been toying with, Im getting really good results with this one too.. if you look at the top of the plug you will see a Very small V cut in to let air in I also found a pen that punches a slightly smaller hole so there is no flooding, However I pulled on it as hard as I could and it did flood but normal hits are really good and emptys the cart... its more consistant then before.. the V cut is smaller then it looks in the picture I had to angle the camera to stop the flash from blinding out the plug..
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Let me help ya guys out.. Heres a hint. Think real good about a infant sippy cup.