Used mine yesterday for the 1st time and was pleasingly surprised at how firm it held the tire air stem! Gave 1 to my son also. Used this with my portable air pump / jumper machine and saved about 10 min’s getting it attached.
They work well so far. You’ll have to tighten the heck out of the brass hex to keep it on. You’ll see. A dab of threadlock on the threads would be a good addition by the manufacturer.