The Craft a Brew Medium Drilled Universal Carboy Stopper is a silicone fermentation stopper designed for use with 5 and 6 gallon PET plastic carboys. This universal stopper creates a seal on compatible fermenters while allowing carbon dioxide to escape through a connected airlock during fermentation. The drilled hole accommodates standard fermentation airlocks, while the universal tapered design helps provide a snug fit across compatible carboy openings. The longer taper and integrated lip help reduce slipping and help prevent the stopper from falling into the fermenter during use. Constructed from BPA-free silicone, this reusable fermentation stopper is suitable for beer brewing, winemaking, mead making, hard cider production, and other fermentation applications requiring an airlock-compatible fermenter seal.
