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Bard part number 1812-0613 is an OEM compressor suction tube used in the refrigeration circuit of select Bard wall mounted air conditioners and heat pumps. This tube routes low pressure suction vapor back to the compressor, so proper fit and internal cleanliness matter for correct oil return, stable superheat, and long compressor life. It is a direct replacement intended to match the original line geometry for easier installation in tight Bard cabinets, but it should still be installed by a qualified technician using approved brazing practices, a nitrogen purge while brazing, and a deep evacuation to protect the system from moisture and debris.