If you're planning plumbing work, understanding fittings like 1/2 copper 90 elbow is a must. These elbows let you quickly change the direction of water flow at a 90-degree angle, making them essential in sharp-turn areas. The humble elbow fitting plays a bigger role than most people think. In

Insert the end with the PEX above the end of your fitting. Slide the top in the PEX tubing which includes the crimp ring or cinch clamp on it around the tip in the fitting that you choose to screwed on to the copper tubing. Thrust it on so far as it will eventually go.[four] X Investigation supply