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Medium drilled Buon Vino universal carboy stopper / bung.
1-5/8" wide at top, 1-7/16" wide at bottom
3/8" hole accepts 3-piece and "S" shaped airlocks for CO2 escape during fermentation
For 20 liter (5.28 gallon) and 25 liter (6.6 gallon) demijohn carboys.