Have you tried connecting a 3" try clamp to the inner container?
I was thinking of trimming down the opening so the part where my finger is and then attach a 3" triclamp.. The opening is about 60mm and would then get a float inside.
This is a very clever idea. Do you have any other pictures? Cant quite work out how the
thanks for replying - not sure where all my post went... I really want to have a go at this as I have access to the 30L Keykegs. I'd really like to ferment under pressure as up until now just been using them...