Turn your ball lock or pin lock Corny Keg into a fermenter! Simply remove the existing lid on your corny keg and use this fermentation keg lid which has a hole drilled in it, install your airlock and stopper and your cornelius keg is now a stainless steel fermenter.
Most Corny kegs are only 5 Gallon in size. You will want to leave a little head room in your keg for the beer to ferment properly and not foam out the top of the air lock.