The Trane COL12849 Coil for 4-Way Reversing Valve is a 24V electromagnetic coil designed to control the operation of reversing valves in heat pump systems. It works by energizing the valve to shift refrigerant flow direction, allowing the system to switch between heating and cooling modes efficiently. https://www.partshnc.com/24vac-coilfor4wayrevvlv-red-5