That's just propylene glycol, no?
Is it any different than buying something like this?
http://www.amazon.com/gp/product/B004KUZ9PM/?tag=skimlinks_replacement-20
Just letting you know that I created an account after an infinite amount of time lurking just to say thank you for this. I'm opening a small taproom and nanobrewery and have been trying to figure out how to avoid paying 8k to have 8-10 taps available. This is how we're going to do it.