FermentArmour Carboy Sleeve. Made of Durable Neoprene for 6 gallon / 23 liter Glass Carboys. Extra strong. Carboy not included. Includes three handles for moving and pouring. Protects beer against harmful light and guards against temperature swings.
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Also: Kegco KC FP-CB-06 Glass Carboy, 6 gallon, Clear – via Amazon