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Bard 800-0070 is an OEM cap tube assembly used in the refrigeration circuit of select Bard wall-mounted air conditioners and heat pumps to meter refrigerant flow and maintain proper system pressures for stable cooling performance. Because capillary tubes are sized for a specific application, this factory replacement is the right choice when a restricted, damaged, or leaking metering tube causes poor cooling, frosting, or abnormal pressures. Confirm compatibility by matching the full model and serial information from your unit to the correct Bard parts list before ordering, and have installation completed by a licensed technician since the sealed system must be opened, evacuated, and recharged to specification.