Whirlpool Genuine OEM W11504436 Refrigerator Lokring Tube Connection Coupler, 0.250" (1/4") - 0.071" Brass Reducer.
Possible Repair Solution For:

Refrigerator is too cold, refrigerator is too warm, freezer is too cold, freezer is too warm, will not start.
Please Note: This is intended as a guideline only, as other items can cause the same symptoms.
This part works with the following brands: Whirlpool, Roper, Admiral, Maytag, Hardwick, Jenn-Air, Estate, Magic Chef, Crosley, Inglis, Norge, Modern Maid, Amana, Kenmore, KitchenAid, Caloric & Ikea.
This part may also be referred to as a Lockring Tube Coupler.