Insert the tip with the PEX above the end in the fitting. Slide the end in the PEX tubing which has the crimp ring or cinch clamp on it over the top in the fitting which you screwed onto the copper tubing. Thrust it on as far as it's going https://salvadorp418wyc8.blogsvirals.com/30305684/indicators-on-1-2-inch-copper-street-90-you-should-know