Breathable Silicone Bung

If you are you are going to be fermenting anything in your oak barrels you will need the to allow CO2 gasses to escape.  This silicone stopper is designed to be both breathable and serve as an airlock. Its innovative design enables the release of CO2 pressure, while effectively preventing the entry of airborne contaminants and oxygen For secondary fermentation use only as a primary fermentation will be to active for the minimal headspace. 

This is a replacement for the V2 Barrels, this isn't compatible with the V1 Barrels.