My new one didn't come with one and my old one didn't have one at all so... I'm just pretty much asking now if it somehow did fall into the engine (which probably would have been a long time ago), is that bad, and, can I pick up another one at a Lowe's or Home Depot. Heh. I'll probably have to bring my old PCV (didn't throw it away yet) as a sample to fit a few of those rubber things on. I don't know how important they are to begin with but I had to wonder why there wasn't one in the first place with the old one I popped out.