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On an interior side wall, near the top or behind a drawer.
Open the fresh-food doors and look for a factory sticker on an inside wall or door frame. The exact location varies by model.
Look for “Model,” “Model No.,” or “MOD.” Copy letters, numbers and the suffix exactly as printed. Example: RF28R7351SR.
“Serial,” “S/N,” or “SER” identifies your individual appliance. It is usually not the number needed to match a water filter.