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Bard 9010-058 is a precision 2.50 mm (0.0984 in) gas orifice used in the gas heat section of compatible Bard wall-mounted gas/electric units to meter fuel flow for proper burner operation. Correct orifice sizing is critical for safe ignition, stable flame, and rated heating performance, so this OEM Bard part is the right choice when replacing a damaged, restricted, or incorrect orifice during service or fuel or altitude setup work. Match the part number to your unit’s model and the specific heat kit or manifold application, and follow the Bard service literature for conversion and setup procedures to ensure proper operation.