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