Insert the tip of the PEX about the top of the fitting. Slide the end with the PEX tubing which includes the crimp ring or cinch clamp on it in excess of the top of the fitting which you screwed on to the copper tubing. Push it on so far https://makeup-brush-protector22109.answerblogs.com/31108502/the-definitive-guide-to-copper-male-adapter