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I don't think it's possible to get an infection from smoking. If you do, at least you'll be too high to care!
Would something listed as a "14mm bowl" fit? From what I've heard, if something is listed as 14mm it is 14.5, and if something is listed as 18mm...
I recently upgraded the downstem in my zong water pipe to a 18.8>14.5 diffuser downstem. It fits perfectly, but my slider bowl no longer fits....