The knob at the bottom of a Whirlpool refrigerator is used to balance the temperature between the freezer section and the main section of the fridge. Temperature control is just one of the uses of this knob. It also acts as the water filter of the Whirlpool fridge. This is, however, not the case for all Whirlpool refrigerators. Some refrigerators have a water filter inside the refrigerator in the top right corner.
The control panel of the Whirlpool refrigerator will notify you when the filter needs to be replaced. A water filter should be replaced whenever you get this notification. You can buy a new water filter but remember to keep the outer knob from the previous filter. This knob does not come with the new water filter.
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