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Bard S400-0203 is an OEM orifice parts bag intended for 45K heating input, supplied for 2 tube burner configurations used in Bard wall mounted gas electric units. This kit is used when servicing or converting the burner or manifold setup so the gas flow is properly metered at the orifices, helping the unit light smoothly and maintain correct combustion performance. Because orifice sizing and application can vary by model series and altitude requirements, match the part number to your unit model and serial information before ordering to ensure proper fit and safe operation.