Works best for primary fermentation of 5 – gallon batches of beer, wine, mead and cider’s or as the secondary fermentor for wines produced from Vintners Reserve or Island Mist wine kits by Wine Expert. Accepts Medium Drilled Better Bottle Bung for use with air locks. Formed from lightweight food grade PET plastic, Better Bottles are unbreakable, safe and easy to clean and do not impart flavors or odors to beverages.