Plastic bung with a drilled hole for airlocks. This universal style has a longer taper than rubber stoppers, for a snug fit and better seal. Fits plastic carboys, Better Bottles and Bubbler PET fermentors.
The drilled hole fits an airlock (#7008 or #7010) for fermentation.
Top Diameter: 2.375"
Bottom Diameter: 1.656"
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