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Bard part S400-0185 is an OEM orifice parts bag used in the gas heat section of select Bard wall-mounted gas/electric equipment with a 5 tube, 125K BTU input configuration. These gas orifices meter fuel flow to the burners, so using the correct factory-specified orifice set helps maintain proper ignition, stable flame characteristics, and safe heating performance after service work on the manifold or burner assembly. Because orifice sizing and application can vary by unit model, serial range, fuel type, and elevation derate requirements, confirm compatibility with your Bard parts manual and unit nameplate before ordering to ensure the correct fit and firing rate.