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Bard 5651-001 is an OEM valve assembly with 1/2 inch by 3/4 inch connections used in select Bard wall-mounted HVAC equipment where a secure, leak-free flow path is required for proper system operation. If you are addressing a restriction, leakage, or service-related replacement, using the correct Bard factory valve helps maintain the intended capacity and reliability of the original refrigeration or mechanical circuit. Verify the part number and connection size against your unit model and service literature before ordering, since valve type and application can vary by series and configuration.