the answer you are looking for is: to bong. are you looking for a slide/pull carb or a rush hole? you can find both here: Bongs and Glass Pipes - Grasscity.com and it's the cheapest place i've seen. they sell RooR, Molino, Magic, etc (and some cheaper brands that are good as trial pieces until you decide to buy that $450 RooR combo with ash catcher, percolator, everything else). i recommend them.