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Bard part number 5650-031 is an OEM heat pump reversing valve assembly with a 24V solenoid coil, designed to shift the refrigerant flow so compatible Bard wall-mount and packaged heat pump units can change over between heating and cooling. With 3/4 inch and 1/2 inch line connections, this valve is a core refrigerant control component that helps restore proper mode change operation when a valve is sticking, leaking internally, or failing to shift. For best results, confirm connection sizes and system match in your unit documentation before ordering, and have installation performed by a qualified HVAC technician since it requires refrigerant recovery and sealed-system brazing.