Silicone Stopper (Breathable) - Carboy
Fits 3,5,6 & 6.5 Gallon carboys and 500ml flasks. 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.
This Stopper quickly became our stopper of choice for wine, mead, cider, and any other product that we planned on bulk aging, such as sour style beers. Used by numerous commercial wineries.
Another great use is for crash chilling your beer, as this stopper will create a vacuum if fermenting wort cools (as opposed to pulling water in from your traditional airlock.) Air tight seal is great for extended fermented lager when CO2 production is still present but very slight. The top measures 1 1/2" wide and the bottom is 1 1/8" wide.