The quality of these certainly doesn't come close to what I'm used to or what I expect. I bought these to use when putting a set of new rims on my truck. The first stem failed about 2 months later - 700 miles from home, pulling a camper on 4th of July weekend. A year later, the second one just randomly sprung a leak. So I'll be returning to the tire store tomorrow to spend more money to have these replaced with better quality stems.Valve stem failures are rare. And I used to work in a tire store. To have 50% of the stems I installed go bad is not normal. Stay far away!