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im thinking of bouilding a pot still. i noticed some guys use beer kegs for that..can u use anytype of beer keg ... or does it have to be stainless steel.. thx

Stainless only

You will only find stainless steel kegs. And a select few aluminum ones. But aluminum hasn't been used to make kegs in a long time. So unless you get a old old keg it will more then likely be stainless.