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The Goodman B4089343 Burner Orifice is a genuine OEM #43 drill-size natural gas spud for ADS80904BXA furnaces and compatible Goodman/Amana models. Threaded into the gas manifold, the orifice meters the precise volume of gas delivered into each in-shot burner. The correct orifice size is critical for proper input rating, flame quality, and safe, efficient combustion.
Orifice sizing is not a place to guess — this factory-original Goodman #43 orifice is matched to your furnace's BTU input and altitude rating. A generic or wrong-size orifice can over- or under-fire the furnace, producing sooting, lifting flames, or carbon monoxide. Always confirm the correct drill size for your fuel type and elevation.
Moderate — threads into the manifold with a nut driver; do not over-tighten or cross-thread. Shut off gas and power, and leak-check the manifold after installation. Verify fuel type and altitude derate before replacing.