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The Bard 5650-020 reversing valve is an OEM heat pump refrigerant control component that shifts the refrigerant flow path so compatible Bard wall-mounted heat pump units can change between heating and cooling operation as designed. Because this valve is part of the sealed refrigerant circuit, correct diagnosis and proper refrigerant handling procedures are essential during replacement, and matching the valve style and connection details to your exact Bard model and serial is the best way to ensure proper changeover performance after installation.