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Bard 800-0038 is an OEM cap tube assembly used in the refrigeration circuit of select Bard wall mounted and packaged HVAC equipment to meter refrigerant flow and maintain stable system operation. A properly sized capillary tube is critical for correct superheat, capacity, and compressor protection, so this factory-made assembly is the right choice when replacing a restricted, leaking, or damaged metering tube. For best results, confirm the exact unit model and serial range compatibility before ordering, and follow standard refrigeration practices during installation, evacuation, and charging.