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How to insulate a beer keg
Purchase the appropriate size keg cozy for your keg.
The most straightforward and often most effective way to insulate a keg is by buying a specialized " keg cozy. " these insulated jackets are usually made from neoprene and are similar to smaller can cozies designed to insulate aluminum cans from the warmth of your hand.
Keg cozies can be purchased from some home brewing supply stores and from specialty manufacturers. Searching the internet for suppliers is the best way to locate and purchase a keg cozy.