I bought this item in July 2016 and only used it a few days ago. My wife ran over a propeller the day before work and the tire went flat. She is a nurse and visits patients at home. Most shops were closed on Labor Day and she worried that she would have to cancel her work. I remembered that I have this kit and I gave it a try. The first mushroom plug broke inside the gun. But the second went well. So far everything looks great and is holding its breath. Definitely a must have in any car or before a very long journey.