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The Bard 5603-004 is a BBR14 metering orifice with a 0.014 inch diameter used in compatible Bard wall mounted HVAC equipment to precisely restrict and control gas flow for proper burner operation and stable combustion. When an orifice is worn, partially blocked, or mismatched, it can lead to ignition problems, improper flame characteristics, or nuisance shutdowns, so replacing it with the correct Bard OEM part helps restore the unit to factory intended performance. Confirm the exact BBR14 stamp and orifice size required for your specific model and fuel setup before ordering to ensure proper fit and safe operation.