I am in the process of building my first pot still which will sit atop a 15.5 gallon keg. This is what I'm thinking for the head at this point. The tower is 2" about 18" long to the T fitting. From the union, it will reduce down to 3/8 to connect to the worm condenser. Please let me know if you think this will cause any issues or if you have any feedback at all.
Thanks for the help!