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Bard part number 5651-116 is an OEM base valve used in Bard wall mounted HVAC equipment to connect and control refrigerant flow between two different line sizes, commonly a 3/8 inch connection to a 1/4 inch connection. Replacing a worn or leaking valve with the correct Bard factory part helps restore proper system sealing and serviceability during repairs like component changeouts, evacuation, and recharging. Match the part number exactly and confirm the line size and connection type on your unit before ordering to ensure proper fit with your existing tubing and service layout.