My essential oil extractor is made from a 5lt pressure cooker.
Copper tubing is inserted into the top and the other end coils through a condenser made from a 25lt plastic drum and all the goodness drains from the tap at the bottom. On a big run I have to either add ice to the condenser or change the water regularly to keep it cool.
I've jammed copper scourers into the tube to get a little bit of reflux going.
You wouldn't believe what I use to seal all my joins.
As you don't want super secure joins, (kaboom
) I make up a paste with flour and water and the heat of the brew cooks it into place. If you do blow a seal it's easy to fix, after you've checked for blockages of course.
I learnt that trick from a little old lady in Jamaica.