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Bard 800-0186 is an OEM heating cap tube assembly used in the refrigerant metering circuit on Bard wall mounted HVAC equipment, helping regulate refrigerant flow for proper heating performance and stable operating pressures. A restricted, damaged, or mismatched cap tube can lead to poor heat output, longer run times, and nuisance trips, so replacing it with the correct Bard factory part is the best way to restore designed capacity and reliability. Because cap tube assemblies are application specific by model and serial number, confirm your unit information and the original parts list before ordering, and have installation performed by a qualified technician following proper refrigerant handling practices.