Kitchen homebrewing accessories that let brewers monitor fermentation activity and seal glass demijohns securely. Home Brew Online Airlocks and Bored Rubber Bungs give hobbyists the confidence of watching bubbles rather than guessing whether fermentation is progressing. Are these simple parts the best choice for a dependable fermentation setup?
⚡ At a Glance
- • Brewing Quality: Bubbler airlocks show visible bubbling while bored bungs form a snug fit on glass demijohns
- • Best for: Homebrewers using glass demijohns who want a simple way to monitor fermentation
- • Not ideal for: Owners of plastic demijohns, since bungs are not suitable for plastic necks
Each pack contains two bored rubber bungs and two bubbler airlocks. Bung dimensions are height 32mm, top diameter 30mm and base diameter 27mm.
Visible fermentation progress – with bubbler airlocks
Fill the bubbler airlock with water and fit into the bored rubber bung; escaping CO2 bubbles pass through the water chamber so activity is easy to see. Airlocks are compatible with bored bungs and fermenting bin lids.
Quick visual confirmation of active fermentation removes guesswork, helping brewers time racking and bottling more confidently.
Snug neck seal – with standard-sized bored rubber bungs
Bungs are standard sized and reusable, designed to sit in glass demijohn necks with a 32mm height, 30mm top diameter and 27mm base diameter. Not recommended for plastic demijohns.
A secure fit prevents excessive venting and reduces the risk of messy blowouts while keeping the fermentation environment sealed.
Reusable and low-maintenance – with durable rubber construction
High-quality rubber construction allows repeated use, with a form that resists strong odours and maintains a good seal after cleaning. Airlocks clip into the bored bungs or fermenting bin lids for straightforward assembly.
Parts can be cleaned and reused for multiple batches, making them practical for regular homebrewing without frequent replacement.
✨ The 4 Key Reasons for Home Brew Online Airlocks and Bored Rubber Bungs
- Two bungs and two airlocks – set up two fermenters or have a spare ready
- Standard-sized bungs – compatible with common glass demijohn neck dimensions
- Bubbler design – vents CO2 without messy overflow during active fermentation
- Low odour rubber – fits snugly without producing a strong rubbery smell
📋 Technical Details at a Glance
- Category: Kitchen, homebrewing accessories
- Pack contents: 2 x bored rubber bungs, 2 x bubbler airlocks
- Material: High-quality rubber (bungs), plastic (airlocks)
- Bung height: 32mm
- Bung top diameter: 30mm
❓ Frequently Asked Questions
Q: Can these be used with plastic demijohns?
A: No, the bored rubber bungs are not suitable for plastic demijohns; they are designed for use with glass demijohns.
Q: How do the airlocks show fermentation?
A: Add water to the bubbler airlock and fit it into the bored bung; escaping CO2 will produce visible bubbles through the water chamber.
Q: What are the bung dimensions?
A: Bung dimensions are height 32mm, top diameter 30mm and base diameter 27mm, standard sized for glass demijohn necks.
🏆 Our Verdict
Suitable for homebrewers who use glass demijohns and want simple, reliable fermentation monitoring. The combination of standard bored rubber bungs and bubbler airlocks gives visible activity checks and a snug seal that reduces overflow and odour. Simple, low-cost accessories deliver long-term value through reusability and robust construction.
