Eagle Brewing FE479 Breathable Silicone Stopper, Fits Carboy

Made of Silicone

Fits 3, 5, 6 and 6.5 gallon carboys and 500 ml flasks

Use CE20 Hose thread adaptor to attach to your sink

The stopper has dimensions as top measures 1-1/2" wide and the bottom is 1-1/8" wide. Allows CO2 to escape but keeps oxygen and airborne contamination out. Simple 2 piece design is easy to clean and sanitize. Eliminates the need for liquid in your air lock. Keeps bacteria and oxygen out of your beer or wine, while letting CO2 escape.
Brand: Eagle, Model: FE479