Description
The Bored Bung 47–58mm is a reusable silicone fermentation bung for 54L glass demijohns and other compatible vessels. Its tapered shape provides a practical stopper for larger vessel openings, while the bored centre accepts a suitable airlock during fermentation.
As a result, the bung helps close the vessel while the fitted airlock allows fermentation gases to escape.
Bored Bung 47–58mm for 54L Glass Demijohns
The Bored Bung 47–58mm measures approximately 47mm at the narrow end and 58mm at the wide end. This tapered design suits 54L glass demijohns that require a bung within this size range.
You can fit a compatible airlock through the centre hole when using the vessel for fermentation. Therefore, the bung suitswinemaking, mead making and other fermentation applications that require a bored stopper.
Reusable Silicone Fermentation Bung
Silicone construction allows you to clean and reuse the bung between batches. In addition, the simple one-piece designmakes it easy to remove, clean and refit when preparing your fermentation equipment.
Before use, check that the bung fits the opening of your fermentation vessel correctly. Vessel openings can vary, so use the stated 47–58mm tapered dimensions when checking compatibility.
Using a Bored Bung During Fermentation
Unlike a solid bung, a bored bung has a centre opening. This opening allows a compatible airlock to pass through the stopper while the bung closes the neck of the fermentation vessel.
During active fermentation, gases travel through the fitted airlock and escape from the vessel. Meanwhile, the bung staysin the vessel opening and supports the fermentation setup.
For more fermentation vessels, stoppers and related equipment, browse our Carboys, Demijohns & Bungs range.
Specifications
- Type: Bored fermentation bung
- Material: Silicone
- Size: 47–58mm
- Shape: Tapered
- Centre hole: Yes
- Reusable: Yes
- Suitable for: 54L glass demijohns and other compatible fermentation vessels





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