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The B4089343 is a genuine OEM #43 drill-size burner orifice (spud) for Goodman DHS80905CXA gas furnaces and compatible Goodman/Amana models. Threaded into the gas manifold, this precision-machined brass orifice meters the exact gas flow into each in-shot burner. Correct orifice sizing is essential for proper BTU input, clean combustion, and safe operation — an incorrect or worn orifice can cause under-firing, sooting, or overheating.
OEM Goodman orifices are drilled to Goodman's exact specification for the furnace's rated input and altitude assumptions. Generic orifices can vary by a thousandth or two, throwing off the gas rate and combustion. Because this part directly affects safety and efficiency, OEM is the recommended choice.
Shut off gas and power, remove the burner, and thread the orifice into the manifold — do not over-torque the soft brass. Match one orifice per burner and confirm manifold pressure and flame quality afterward. Technician recommended.