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Bard part 5650-040 is an OEM refrigerant reversing valve assembly with a 24V coil and 7/8 inch by 1/2 inch connections, used in Bard heat pump style wall mounted units to direct refrigerant flow when the system switches between heating and cooling. If your unit is stuck in one mode, fails to change over cleanly, or shows symptoms consistent with a failed changeover valve or solenoid coil, replacing the reversing valve with the correct Bard part helps restore proper operation and designed performance. Confirm the tubing connection sizes and the correct Bard part number for your specific model and serial number before ordering, since reversing valves are application specific and must match the original piping layout and coil voltage.