I have several Air Chucks in my shop for different purposes. Open flow allows for much faster inflation, e.g. e.g. installing tire beads etc. As I repair cars and am retired I don't do this on a daily basis but at some point high flow or a coreless valve stem may be required. which these open stream versions require. They are comparable to others I have and appear to be of good quality. However, they are so tight on the stems of some valves that the difference is noticeable. High quality cartridges switch on and off where little wobble and force is required. No big deal really. but I'd rather they fit properly for quick install and uninstall. It's not bad enough to worry about the exchange. still a lot and still working.