The end popped off and required me to hold the head on while pumping air, more pressure in the tire the more it wanted to blow off. After it let all the air out of my tire when I was just trying to top off after airing down I had to put a tube in. I could only get the tube to about 25lbs without the thing blowing apart. Ended up pinch flatting miles from the trail head just trying to limp the thing back in.
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