Insert the end with the PEX in excess of the tip of the fitting. Slide the end with the PEX tubing which has the crimp ring or cinch clamp on it more than the end with the fitting which you screwed on to the copper tubing. Press it on as https://bobbyv741gik1.laowaiblog.com/31233636/the-smart-trick-of-1-2-copper-90-elbow-that-nobody-is-discussing