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The Goodman B1392139 View Port Bushing is a genuine OEM sealing grommet that fits the flame-inspection sight opening on the AMES920603BNAA gas furnace and related Goodman/Amana models. It maintains a tight seal around the view port so combustion air, flue gases, and heat stay contained within the burner compartment while still allowing a clear line of sight to the flame during service.
Because this bushing sits in a combustion area, correct high-temperature material and exact port diameter matter for a proper seal. The OEM Goodman part is molded to spec and rated for the temperatures inside the burner box. Generic grommets may not hold the seal or tolerate sustained heat, risking flue-gas leakage.
Difficulty: Easy (1/5). Power and gas off, pop out the old bushing, and press the replacement into the port opening — typically under 10 minutes with no tools. A quick, inexpensive part that restores a safe, sealed combustion compartment.