What type of water supply line should I use for the refrigerator?
You should use a water supply line made of braided stainless steel tubing or polyline. While copper water lines are not recommended, if you choose copper, you must use a new compression nut and ferrule and should not reuse compression fittings or use thread seal tape. (Page 3-4)
From the official Frigidaire FRSS2623AS French Door Refrigerator manual, page 4
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