Whenever I go to Jiffy Lube and change the oil they check the tire pressure and top up if necessary which is good. But later I notice that sometimes they forget to put the cap back on. I came back and they put one back on but it takes my time. This also happened at a tire shop when I got a repair. So I brought this 36 pack to be ready next time. I've used 2 already and have plenty of spares for the future. They fit well and appear to be of good quality with no issues and the very affordable price is great. Keeping the valve clean is also helpful in preventing accidental tire deflation.