I purchased a bucket just like this from my local home brew shop. I noticed that this lid is secured by the metal hooks on it but it does not snap down and create a seal like my 6 gal bucket lids do. Since this is not air tight should I 1. use this as a primary fermenter (or return it)? and 2. install an air lock on it? I know that this will keep junk from getting into the beer but how important is it that it be air tight? I can also cut a piece of plywood and get some tie downs to put more pressure on the lid.
I've been wondering lately... with that amount of beer in a container, is there a greater risk of creating too much CO2 and blowing the lid off? Or does the fact that it's not airtight reduce the risk since the gas is continually leaking out?