Demijohn Rubber Bungs and Airlock Caps

Seal demijohns and fermentation vessels confidently with these white rubber bungs and caps, designed to help keep your brew protected from unwanted air and contaminants. They provide a snug, reliable fit for home brewing and winemaking, while remaining easy to remove and refit when needed.

Made from flexible white rubber, each piece is designed for a secure, hygienic seal and can be cleaned and reused between batches. Depending on the option selected, you can choose a standard bung, a bung supplied with a cap, or a cap-only style for covering suitable demijohn openings.

These bungs and caps are ideal for everyday brewing tasks such as fermentation, conditioning and short-term storage. They suit a range of demijohn neck sizes, so you can match the correct option to your vessel and keep your set-up consistent across batches.

To choose the right variation, select the required size and style from the options, then pick your preferred pack size. If you’re replacing worn parts or building a spare kit for cleaning days, multi-packs offer a convenient way to keep backups on hand.