Like many others, it takes some time to figure it out. It's a great idea, but even knowing how to use it only worked for a while. The valve gets stuck after unscrewing, constantly stopping airflow. It worked on two of my four tires with no issues, but the time spent on the other two would have allowed the air to deflate more quickly using a rock to put pressure on the valve. When it works, it works well, allowing you to switch between venting and pressure testing in seconds.
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