Insert the water fill tube into the hole you opened up in the back of the refrigerator. The tube that you insert will have a half-moon shaped tube with the “U” facing up when installed.
Turn the tube a quarter turn to the left when installing and then turn to the right to lock it in place. The tube has locking clips on the sides of the fill tube.
Once installed, install the round foam tube insulation over the fill tube and press it into the back channel.