What ash catcher joint size do I need for "18.8 mm > 14.5 mm"?

Discussion in 'Bongs, Dab Rigs, Bubblers, Water Pipes' started by GlassClass, Dec 2, 2011.

  1. The options are 18.8 and 14.5 on the perc/ashcatcher, but I've never bought one like this. Not sure which size to get.
     
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