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Bard 5451-029 is an OEM nylon sleeve used as a wear and isolation bushing in Bard wall mount and packaged HVAC equipment to help protect wiring or tubing as it passes through sheet metal and to reduce vibration related rubbing. With a 0.257 inch inside diameter and 5 inch length, this sleeve is commonly cut to fit during service to restore proper spacing and prevent chafing that can lead to shorts, refrigerant line wear, or nuisance noise. Use the original part number to match your unit and confirm quantity and placement from the Bard parts list for your specific model and serial range.