CCV system

I was working on my 95 Jeep YJ and I found that there was a little bit of oil in and around my throttle body. I decided that it was time to inspect my pcv valve a little closer. But on going this direction, I found that it does not have a pcv system, it has a ccv system. I also read that there should be some sort of rubber insert in the end of the tube in the valve cover. However, when I pulled the tube and fitting out of the vavle cover, there was no insert, just an open tube. I see no way to keep oil from being sucked into the tube and then into the intake manifold. Am I right about this and should I be concerned that there is possibly something floating around in my valve train, or should there not be anything in the end of the tube? I would appreciate any help. Thanks.