I have used this tool at least thirty times. I won't waste much space on positive comments already made by over 1000 other reviewers. But I will respond to negative comments. The simple design and performance of this device are so effective that the negative reviews must come from users who had no idea what they were doing. Once you understand that the valve core needs to be completely disabled, there's no other option but to get this thing to work. Don't worry, the core is held securely in the device when aired out. I will notice one small issue, but it could be my valve stem design - a little trick has to be used when fitting it to the stem to prevent cross-over. - refueling.
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