So my cousin passed me down some kegs (some ball lock/some pin lock
) but also what appears to be a 10 gallon firestone with a racetrack keg lid. The lid has a normal pressure relief valve like you'd see on a typical ball lock but when I looked at the botton of the lid it appears to have been welded off. I reached out to chicompany hoping they have a functioning lid replacement but my question is WHY someone would do that? The keg itself has a ball lock liquid out post and diptube but is missing entirely the gas post, it's just a hole. I have no idea why a brewer would want this type of configuration.
Also, Do I need a special ball lock fitting for the gas post or can I just use a typical gas post assembly?

Also, Do I need a special ball lock fitting for the gas post or can I just use a typical gas post assembly?