How do I properly install the water line for the automatic icemaker?

You will need copper tubing (1/4 inch outer diameter) connected to a cold water supply with a shutoff valve. The water pressure must be between 20 and 120 psi on models without a water filter and between 40 and 120 psi on models with a water filter. Follow the detailed installation instructions in the manual, including drilling a hole in the water pipe, connecting the tubing with compression fittings, and flushing the line before connecting to the refrigerator. (Pages 35-37)

From the official Kenmore Elite French Door Refrigerator with Ice and Water Dispenser manual, page 35

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