What type of water supply line should I use for the ice maker?
You should use a water supply line made of braided stainless steel tubing or polyline to avoid property damage. If you choose to use copper tubing, you must use a new compression nut and ferrule and cannot reuse compression fittings or thread seal tape.
From the official Frigidaire FRSS2623AS French Door Refrigerator manual, page 4
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