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Food grade white gum rubber stoppers (aka rubber bungs) for carboys and jugs. #6.5 is the size that best fits our carboys. #6 will fit in a one gallon glass jug. #3 will fit well in the neck of a standard beer bottle. Drilled stoppers are used for airlocks or blowoff tubes, while a solid stopper is only used for aging after fermentation is complete.
Size Chart:
| Size | Top Diameter | Bottom Diameter |
| 2 | 3/4″ | 5/8″ |
| 3 | 15/16″ | 3/4″ |
| 5.5 | 1-1/8″ | 1″ |
| 6 | 1-1/8″ | 1-1/16″ |
| 6.5 | 1-3/8″ | 1-1/8″ |
| 7 | 1-7/16″ | 1-3/16″ |
| 7.5 | 1-1/2″ | 1-1/4″ |
