Product review (5 stars): easy and cheap
I've never done this before. And I was nervous to put it on, thinking it was going to.cause a leak in the copper line. I ran the line using the insert.  Tightened everything on the fridge and the tapping unit. Then I tapped the water line. So far so good. No leaks. Even works as off valve. If I ever need to service the fridge.  I am satisfied and recommend this product. Ease of use. Price, and quality