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Bard part number 5650-039 is an OEM 24V reversing valve used in Bard heat pump and wall mounted HVAC equipment to shift refrigerant flow between heating and cooling operation. With 3/4 inch and 1/2 inch line connections, this valve is the core changeover component that helps restore proper mode switching when a system is stuck in heat or cool, shows incorrect discharge temperatures, or will not respond correctly to a thermostat call. Because reversing valves must match the original capacity and connection sizing, confirm your unit model and the existing line sizes before ordering, and have a qualified technician handle recovery, brazing, evacuation, and leak checking during replacement.