| TOP | BOTTOM | HEIGHT |
| 36 mm | 29 mm | 34.9 mm |
| 1 7/16″ | 1 1/8″ | 1 3/8″ |
Fits glass carboys that take a #6 1/2 or #7 stopper.
A breathable silicone stopper that acts as both a stopper and an airlock. Unique design allows CO2 pressure to escape but keeps oxygen and airborne contamination out. Sometimes called a breather, vent bung or ventilating bung.
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