Precoolers for glass bongs with 14.5mm ground joint. The 14.5mm size in this case relates to the connection size of the bong. Please be aware that there are some pre-coolers for glass bongs with different connection sizes on the upper and lower side - for example, they might adapt a bong with connection size of 14.5mm to a bowl with an 18.8mm joint - the exact specifications can be found in the product characteristics or the item description.
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