Carboy
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A carboy, also known as a demijohn, is a rigid container with a typical capacity of 4 to 60 litres. Carboys are primarily used for transporting liquids, often drinking water or chemicals.
Large plastic bottles for a water dispenser
A 25 L (6+1⁄2 US gal) glass carboy acting as a fermentation vessel for beer. It is fitted with a fermentation lock.
A Bulgarian demijohn (damadzhana)
Fermentation lock
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A fermentation lock, colloquially air lock or just lock, is a device used in the production of fermented beverages, especially beer brewing and wine making.
Carboy
…is a glass or plastic vessel used in fermenting beverages such as wine, mead, cider, perry, and beer. It is usually fitted with a rubber stopper and a fermentation lock to prevent bacteria and oxygen from entering during the fermentation process. During the homebrewing process, a primary carboy is used for fermentation…
A homebrewing vessel with air lock