Its just to keep the hoses cool if youre running them externally. Theres no way it would be able to keep up colling a line if you were getting multiple beers. Besides, how long a kerg lasts has lot to do with not only the way it is pressurized (co2 vs. hand pump) but also what temperature its stored at. You cant store it at room temperature. It wont last at all.
You need some way to keep the actual keg cooled down
Check craigslist.com, theyll either have really cheap if not FREE refrigerators for pick-up
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