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Fits beer bottles, newer (since December 2008) Siphonless Fermenter lids, and other 3/4" openings. Drilled for a standard airlock.
Pros: Absolutely pure, inert, no flavour or odour -- common black lab stoppers have a terrible asphaltum odour flavour and scent. Cons: These are slippery little critters when wet, and if yours pops out of the carboy/bottle, simply try again or switch to another size.