Chapman Fermenters are made of stainless. They feature a silicone gasket in the lid for positive sealing. Gallon markers are inside, Both ported and unported versions are available in 7 and 14 gallon sizes. These are unitank vessels meaning they can be used as both a boil kettle and as a fermenter.
Chapman Brewing… makes great fermenters! Check out: Hands On Review: Chapman Brewing SteelTank Fermenter
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