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Bard part number 5651-051 is an OEM 3/8 inch OD sweat shut off valve used on Bard wall mounted HVAC equipment to isolate a refrigerant line during service, component replacement, or system diagnostics. This valve is designed to braze into a 3/8 inch copper tube connection and provides a dependable way to close off flow when you need to recover refrigerant, replace a component, or perform leak checks without disturbing more of the circuit than necessary. For best results, confirm the part number against the unit model and serial tag and use proper brazing practices and nitrogen purge to protect the refrigeration system during installation.