I just swapped out the old PCV in my car for a new one a few days ago. First time doing it, I assume it wasn't the first time done on my car, however. The rubber O-Ring that's supposed to be around the PCV was not there. I looked inside of the PCV area to see if it was stuck in there but did not see it. I assume the person who had the car before me either shoved it down into the engine (would that do any harm if that is what happened?) or maybe they had just lost it and did not replace it. I'm probably going to pick up another one later today, I suppose I can get something similar at Home Depot or Lowe's, right? Thanks.