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Bard 800-0076 is an OEM cap tube assembly used in Bard wall mounted air conditioners and heat pump systems to meter refrigerant flow through the refrigeration circuit. Capillary tubes are critical to stable cooling performance, so replacing a restricted, damaged, or leaking cap tube assembly can help restore proper system pressures, capacity, and compressor protection. Because cap tube sizing and routing are application specific, confirm your unit model and serial compatibility before ordering to ensure correct fit and proper refrigerant control with genuine Bard parts.