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Bard part number 5651-054 is an OEM base valve used in Bard HVAC equipment to provide a dedicated service valve point for isolating and servicing the refrigeration circuit during diagnostics, evacuation, charging, and component replacement. A properly sealing base valve helps technicians control refrigerant flow and maintain system integrity when connecting gauges or performing repairs, which is especially important on wall mounted Bard units where access and downtime matter. If you are replacing a leaking or damaged valve body, confirm the unit model and the line connection sizing before ordering to ensure correct fit and dependable operation with Bard factory specifications.