Help identify piece

@kursplat I was just looking in to those after following another member's garage build where he mentioned them and it sent me down the PCV rabbit hole... I had to throw it on the "eventually" wishlist for now... incredible amount of info for something, that at first glance, seems like such a simple, "nothing" component.
ya, seems like a "oh really? :rolleyes:" type of thing. but between the anadotal stuff from people like slantsixdan on getting the right PVC, and a lot of articles online and in magazines, (some of which are linked on m/e wagner's site), about using one of these to tune the PVC on a built engine, makes ya wonder...anyway, i have one on the shelf for when i get the valiant running again