I got a keg off a fellow homebrewer (he had never used it) and I went to pressurize it with star san today, and it seems to be leaking around the lid. When i click the lid over, it doesn't seem to fit tightly. Do I need a new lid, or just a new O-Ring. The current one looks pretty good and solid. No pieces missing and its still pliable.
Thanks in advance, and Cheers!