|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 or vent bung.
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