This is a replacement water filter cap for your refrigerator. The cap is made of gray plastic and is approximately 2.5 inches in diameter. It is sold individually. The water filter cap protects and secures the water filter on the bottom of the refrigerator. If it is cracked, broken, or missing, this is the part that replaces it. To complete this repair, simply remove and discard the damaged cap, and replace it with the new one. This is an OEM part sourced directly from the manufacturer.