Why are these not suitable for plastic demijohns please (as stated in the description)?

Many plastic demijohns are made of non-rigid lightweight plastic which could prevent the bung making a good seal. If it works for you, then no problem.

How much do I need to fill airlock with water

We filled it maybe up to 2.5 bubble, make sure no water gets inside your brew.

Need airlock and bung to fit 45-55mm

If you contact specific Sellers directly through their Amazon contact details, I am sure they/we can sort you out. Regards, Lee

Do u tighten the wee red cap

Thanks for your question, the red caps are not essential - they are just dust caps and fit loosely on the top to keep any contaminants out, Best regards, Home Brew Online

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Description

🍺 Brew Bold, Bubble Proud – Fermentation Made Visible!

REUSABLE DURABLE - High-quality rubber bungs built to last through multiple brewing cycles, reducing waste and cost.
COMPACT LIGHTWEIGHT - At just 80g and small dimensions, these components are easy to store and handle without cluttering your brewing space.
COMPLETE 2 PACK CONVENIENCE - Each set includes 2 bored rubber bungs and 2 bubbler airlocks—double up your brewing game or share with a fellow enthusiast.
CLEAR FERMENTATION MONITORING - Add water to the airlock and watch your brew bubble—real-time visual proof your fermentation is on point.
PERFECT FIT FOR GLASS DEMI JOHNS - Standard-sized rubber bungs designed to snugly fit glass fermenters, ensuring airtight fermentation.

This 2-pack set from Home Brew Online includes two reusable bored rubber bungs and two bubbler airlocks designed specifically for glass demi-johns. The airlocks allow brewers to visually monitor fermentation through bubbling, while the durable rubber bungs ensure an airtight seal. Compact and lightweight, these components are essential for any homebrewing enthusiast aiming for precision and reliability in their craft.

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