Drilled universal stoppers are rubber stoppers used to affix an airlock to a glass carboy. These are the perfect size for any modern, standard glass carboy, including 3, 5, 6, and 6.5 gallon sizes. Make sure you have enough of these on hand when you are crafting something great!
- Top Diameter: 1.56 in.
- Bottom Diameter: 1.156 in.