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Bard part number 5651-072 is an OEM expansion valve with 3/8 inch by 3/8 inch connections used in Bard wall mounted air conditioning equipment to meter refrigerant flow into the evaporator. A properly matched valve is critical for stable superheat control, consistent cooling performance, and compressor protection, especially after a sealed system repair or when replacing a restricted or leaking metering device. Confirm the connection size and application in your unit parts list before ordering, and have installation performed by a qualified technician who can evacuate and recharge the system to Bard specifications.