Check the listing for details. Buon Vino Medium Bung, Solid. Condition: New. Listed at 6.12 USD. Buon Vino Medium Bung, Solid A Buon Vino carboy bung is a premium option for homebrewers who truly care about their craft. This rubber bung has a long taper to ensure a tight seal that prevents any oxygen from contaminating your brew. It also utilizes a unique lip so you don't have to worry about it falling into your carboy. You can trust Buon Vino to provide solid rubber construction and this bung doesn't have an airlock hole. It shares dimensions with a standard #8 1/2 rubber stopper and fits 20 and 25 liter plastic carboys and 34 liter demijohns. *Please note: Also available with an airlock hole by clicking here.*. In stock and ready to ship. Features: Made of rubber. Extra-long taper to create a tight seal. Protruding lip to prevent accidental drop into carboy. Same measurements as #8 1/2 rubber stopper. Fits 20 and 25 liter plastic carboys and 34 liter demijohns. Specs: Dimensions: 1 13/32' Bottom diameter.