Factory Certified OEM Authentic and Genuine part from Sub-Zero in Madison, Wisconsin. This 4204490 Replacement Subzero Water Filter can be used in Built-In Refrigerators, Integrated Refrigeration, and PRO refrigeration. To ensure clean crisp water, make sure to replace your Subzero Water Filter 4204490 every six months. Only use genuine Sub-Zero water filters in your Sub-Zero Refrigerator. This Sub Zero Water Filter replacement part will ensure that your whole family is drinking safe drinking water.