Narrow neck demijohn stopper / bung Ø45mm

A rubber cap-stopper for fermentation bottles is, alongside an airlock, an essential item for every enthusiast of home winemaking, beer brewing, or distilling washes.

• Excellent seal - the specially designed shape, protruding ribs, and high elasticity make the stopper fit the demijohn neck perfectly. The internal hole fits an airlock of any diameter.
• Made of durable rubber - rubber is resistant to acids and alcohol, ensuring the stopper’s durability and reliability throughout the entire fermentation process.
• Two installation methods – depending on the diameter of the vessel it is used with, the cap can be used either by stretching it over the neck or by pressing it into the neck.
• Eco-friendly - the rubber stopper is reusable, which helps reduce waste.
• Easy to use - the ergonomic shape and protruding collar make it easy to grip, making it simple to handle.
• Can be used as a bird waterer

The red rubber cap–stopper is an ideal, airtight closure for fermentation vessels such as a demijohn or bottle. Depending on the neck diameter of the fermentation vessel, you can either stretch it over the demijohn neck or insert it inside the neck.

Size

Ø 45 mm

Installed inside the neck, fits:

Carboy - 644054 .

Installed on the neck, fits:

Demijohns – 640205 , 640225 , 640105 , 640125 , 640025 .

Important

• You can place any airlock in the stopper, regardless of its diameter.
• In our store, caps are available in five sizes with diameters that fit carboys and demijohns from 5 L to 54 L.

Fun Fact

Rubber stoppers for fermentation bottles can also be used as bird waterers.