I have a couple of 25 litre glass demijohns that I intend to age some rum and whisky in. The depth should make it easy to occasionally drop an airline into it for acceleration of the process.
The local HBS where I bought them from only has rubber bungs. I assume that rubber falls into the same category as plastics?
Anyone know where I can get silicone or cork bungs of approx 40 mm diameter.
Alternatively can I custom make a silicone one using silicone from a caulking gun?