The Whirlpool WP12722803W Door Vertical Rail Mullion Heater helps prevent moisture buildup and condensation along the refrigerator door's vertical mullion area. This white replacement component incorporates a heating element that gently warms the mullion surface, reducing the formation of frost and moisture where the refrigerator doors meet. It supports proper door operation by helpin... https://www.partsmelange.ca/whirlpool-wp12722803w-door-vertical-rail-mullion-heater-white-for-refrigerator