The Rugged Ridge tire deflator is designed to be used with a tire gauge such as Accutire or similar. If you stick it in a valve stem and expect it to "do" something other than deflate your tire, you'll be disappointed. If you use it to inflate 37 inch tires from 40lbs ---> 15lbs for 4x4 traffic then this tool is awesome. It's just not an "autopilot" tool. efficient and very comfortable. He's doing exactly what he's supposed to do. Let go of those suckers.