the american fridge freezer?

hello we have an american side by side fridge freezer. The 6mm water pipe thats comes down inside the edge of the door. Theres a pin hole where the pipe goes through the hinge. The water dispencer and the ice despencer are side by side in a recess half way up the freezer door. How do i get the old pipe out to replace a new pipe?. Where could i purchase a new 6mm plastic pipe?.