Want an easy-to-use, stainless vessel that ferments and carbonates? These kegs have been modified to allow you to do both! The top is fitted with a large 4 inch tri-clamp lid with two ball lock posts and a pressure relief valve. You can use this vessel to ferment, carbonate, serve, or push the beer through a filter. The posts are recessed which allows you to stack these kegs up to 4 high. A 4" T.C. end cap with pre drilled hole is also available, which can be paired with a #3 stopper and airlock.