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Bard part 9043-063 is a natural gas burner orifice sized #43, used in Bard gas heat sections to meter the correct amount of fuel to the burner so ignition, flame stability, and heating performance stay within factory specifications. Because gas orifices are precision sized and directly affect combustion, this OEM Bard replacement is the right choice when you are correcting an overfire or underfire condition, replacing a damaged or stripped orifice, or restoring proper operation after a gas conversion back to natural gas where applicable. Confirm the required orifice size and the number of orifices needed by model and serial, then match your existing stamping and installation style before ordering to ensure proper fit and safe operation.