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This part looks something like a radiator. It has tubes with fins attached and is located near the cooling fan to be able to draw room air over the fins to prevent overheating.
This GE Water Supply Tubing is a 15-foot long genuine OEM part that carries water from the home's supply to the refrigerator. It includes compression fittings and fits with brands including GE. Disconnecting the appliance from utilities is recommended before installation.