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The Goodman B4089343 #43 Burner Orifice is a genuine OEM brass spud for the Goodman ADV80905CXBB gas furnace and compatible Goodman/Amana models. The orifice threads into the manifold and precisely meters natural gas into each in-shot burner. The drill size — #43 — sets the BTU input per burner, so using the correct orifice is essential for safe, efficient, correctly-rated combustion.
OEM vs. Generic: Genuine Goodman orifices are drilled and gauged to the exact #43 specification and manifold thread. An incorrectly sized or off-brand orifice changes the fuel rate, which can over-fire the furnace (safety hazard, cracked heat exchanger) or under-fire it (poor heat, sooting). For gas-metering parts, always use OEM.
Install difficulty: Moderate — must match manifold thread and gas type; typically replaced with the manifold accessible. Plan 20 to 30 minutes. Shut off gas and power, verify the #43 size and NG rating, and leak-test before restoring service.