Heh, too late, I already ordered it. Last I looked, it doesn't appear to have anything like that in the cylinder. I could be wrong since I now know what's supposed to be between the flange and cylinder. I had a exhaust leak because the bottom nut on the flange wasn't screwed in all the way on the stud. I'll check it out this weekend, if there is a gasket in there, I'll just go ahead and replace it anyways