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Bard part number S400-0183 is an OEM orifice parts bag for compatible Bard wall mounted gas/electric units that use a 3 tube manifold and a 75K furnace input configuration. This kit is used during service to restore proper burner fuel metering at the manifold so ignition, flame stability, and heating performance stay within Bard specifications. Because orifice sizing is application specific, confirm the model and serial number and match the 75K, 3 tube requirement in your Bard parts manual before ordering to ensure correct fit and safe operation.