Glass Bong Reducer 18.8mm-14.5mm
It's very rare that a glass bong doesn't have either an 18.8 bowl or a 14.5 bowl - these are just the two standards. But if you have an 18.8 gauge bong (one with a drop-pipe that's 18.8mm across) AND this simple piece of glass, then the world of bowls and precoolers is, indeed, your oyster.
This piece of glass simply allows an 18.8 drop-pipe to fit a 14.5 bowl, meaning that you can have your choice of bowls.
This can also be handy if you're interested in fitting a particular per-cooler, percolator adaptor, or ash-catcher.
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