How to remove a stuck Sharkbite connector from a PEX tube?
Try pushing the pipe in a bit, before pulling it out.  Sometimes the barbs dig into the pipe, so the release ring can't disengage them. Pushing the pipe in, may allow the release to completely disengage the barbs.


Use the tool to compress the release ring.
Push the tubing deeper into the fitting, while keeping pressure on the release tool.
Pull the tubing out of the fitting.


During step 2, you might feel the release ring move slightly closer to the fitting. This is a good sign that the barbs are fully retracted, and the pipe is ready for retraction. If you don't feel the release move, don't worry, it might just be too slight for your sore fingers to feel.

Alternatively, try reversing steps 1 and 2. Push the tube deeper into the fitting, then use the release tool to operate the release mechanism.