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Bard 800-0373 is an OEM cap tube assembly used in the refrigeration circuit of compatible Bard wall mount and packaged HVAC equipment to meter refrigerant flow for stable cooling performance. A restricted or leaking cap tube can lead to poor capacity, coil icing, or erratic pressures, so replacing it with the correct Bard factory part helps restore proper system operation and protects major components. Because capillary assemblies are application specific by model and refrigerant, confirm the exact unit model and serial number, and follow Bard service procedures for refrigerant recovery, evacuation, and recharge when installing this 800-0373 assembly.