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Bard part 5220-013 is an OEM discharge muffler (pulsation dampener) used in Bard wall-mounted HVAC equipment to smooth compressor discharge pulses and help reduce vibration-related noise in the refrigerant circuit. If your unit has developed a harsher compressor sound, line chatter, or you are replacing compressor-related piping components, installing the correct Bard 5220-013 muffler helps restore the factory-designed sound and system stability while maintaining proper fit with compatible Bard models. Because this is a refrigerant-line component, confirm model and serial compatibility in the unit parts manual and follow proper recovery, brazing, and evacuation procedures during replacement.