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Bard part number 5651-207 is an OEM thermostatic expansion valve assembly with 3/8 inch by 3/8 inch ODF connections, used to meter refrigerant into the evaporator coil for stable superheat control and dependable cooling performance. A properly functioning TXV helps prevent evaporator flooding or starving, which can show up as poor capacity, coil icing, or nuisance trips, so replacing it with the correct Bard valve is important for system reliability and correct fit on matched Bard wall-mount equipment. Verify your unit model and refrigerant application before ordering, since Bard lists multiple expansion valve options across similar platforms and this part should be matched to the specific factory bill of materials.