Pick up two airlock and stopper combos for a lower price! Includes two S-Shaped airlocks and two Universal Stoppers. Fits a 2.8, 3, 5, 6, or 6.5 gallon glass carboy, as well as 500ml Erlenmeyer flask.

Please Note: This stopper will not fit in plastic carboys, Better Bottles or Speidel Plastic Fermenters.