Product review (5 stars): Great Ice Maker Hook Up Kit
The Tee fits in/on 1/2" water line whether copper, PVC, CPVC or PEX.

It's super easy to install, just cut a half inch section out of the water line to make room for the tees extra length and then just push the tee onto one end of the cut water line and then feed the other cut end into the other end of the tee. Make sure to push hard until you feel it move past the first resistance and up against the firm stop on both sides.

The Tee has a ball valve built in that allows you to shut off the water to the fridge without shutting off the water to the whole sink or the whole house and seems to work fine. (note it took some pretty good effort for me to open it after having water pressure on it).

The 1/4" tubing seems like good heavy weight line which should last a long time.

To hook the tubing up you only have to push one end into the 1/4" line of the tee and it's done. As for the refrigerator end there are a couple ways to hook it up.

First being just using the white coupling seen in the picture, it works just like the tee does when inserting it in the 1/2" water line. Just push it onto one end of the tubing then onto the end of the 1/4" line coming out of the refrigerator. (if you have a fitting on the line coming out of the refrigerator you'll have to cut it off first). That is how I did it as the refrigerator didn't have the middle part of the compression fitting attached so I would have had to go buy one.

The second way is to use the compression ferrel (little white ring) and the compression nut on the end of the line. Again this requires the fridge has the compression fitting and the part this kit compresses onto.

But these slip type fittings work very well, I'm not sure exactly how there made and work so good but they do... the kit with the slip type tee and 1/4" line parts make this kit so easy to use... I highly recommend it.

On a side note. My kit didn't come with the red "lock" clips you see in the picture. The bag lists the contents inside and didn't list those pieces either. But it appears it would be very rare that the line would come out without it. I first tried taking out one line after inserting it and it was a bit of a struggle as you have to hold down the little lip that the line pushes into to be able to pull out the line.