I like this tool. However, I have encountered valve cores that cannot be removed with this tool due to its length. If you feel like the valve core is completely removed, but don't want to close the ball valve on the tool, don't try to force it! The lever should turn easily. If the lever seems to be sticking, the valve core is probably still in the way. If you force it, a situation can arise when you lose all freon in the system.
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