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Bard part S917-0403BX is an OEM coil assembly, boxed for service replacement, used in Bard wall-mounted HVAC equipment as a critical heat exchange component that helps the system transfer heat properly for stable cooling performance. Replacing a damaged, leaking, or restricted coil assembly can restore normal capacity and efficiency while helping protect other refrigeration components from abnormal pressures and temperatures. Because coil assemblies vary by unit model, capacity, and refrigerant circuit configuration, confirm S917-0403BX against your Bard model and serial number documentation before ordering to ensure proper fit and connection alignment.