4 x Handy Airlocks & Bored Rubber Bungs for Wine and Beer Making by Almost Off Grid. Made from high-quality rubber, our bungs are designed to fit snugly into standard-sized fermenting vessels. They provide an airtight seal that helps to maintain a consistent fermentation environment, while also allowing excess gas to escape through the airlock. Just fill the airlock to ⅓ with water. When fitted with the bored rubber bung, the unit protects the ferment from contamination.
The Rubber Bungs are standard-sized and reusable.