These grommets are the perfect replacement for those found on standard fermentations buckets. They have an inner diameter of 3/8" and an outer diamter of approximately 5/8". These fit neatly into a 3/8" hole, allowing an airlock to be placed inside. These are perfect not only for beer and wine, but also for mason jar lids when you want to ferment sauerkraut, kimchi, or any number of other fermented foods! Will work with standard double bubble and 3 piece airlocks.
- Inner Diameter: 3/8 in.
- Outer Diameter: 5/8 in.
- Required Hole Size: 3/8 in.
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