It's really hard to tell sometimes. Back when they made kegs like that, they were made of both. It looks like aluminum because of the dullness of the metal, but I could be wrong. Try sticking a magnet to it. Most aluminums will not hold a magnet. Then again, not all SS will hold magnets and you really want the SS that doesn't.
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He who drinks beer sleeps well. He who sleeps well cannot sin. He who does not sin goes to heaven.
Another HERMS rig...
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