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The Bard 5651-077 expansion valve is an OEM thermostatic expansion valve (TXV) used in Bard wall mount air conditioners to meter refrigerant into the evaporator and maintain proper superheat for stable, efficient cooling. This 3/8 inch by 3/8 inch ODF valve is commonly specified for certain 2-1/2 ton Bard systems, and it is the right choice when you are correcting issues like hunting, poor capacity, or abnormal suction readings tied to a worn or restricted metering device. Because TXV selection is application-specific, confirm the exact part number and match it to your unit model and serial before ordering to ensure correct fit and performance.