So I have this corny keg I picked up from a buddy - looks exactly like a regular pepsi keg except that when you try to connect the gas or liquid lines, they wont go on. Turns out the ball lock connectors are ever so slightly wider on this keg than on a normal one we've been using. So I unscrew these connectors and try another one from another keg, and the threads are just a tiny bit wider, so a normal connector wont screw onto this keg. Hmmmm - ever heard of this size before?