Review on C508 Rubber Valve Stem (100-Pack) - Topline by Michael Heidelberg

So far, great easy install if you have an easy to blow up tool, no leaks. great price am very happy with it. We've used them on quite a few tires, two months later the tires are still holding air and the stems are working. The only problem I've had is using an air feed at gas stations. They don't seem to be working, but I'm not sure if it's a storage or ammo issue.