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The Goodman B1392139 View Port Bushing is a genuine OEM sight-glass fitting for the Goodman/Amana AMS81405DNBB gas furnace. This bushing seats in the burner-compartment door and holds the flame-observation view port, allowing safe visual inspection of burner flame while maintaining a sealed, rattle-free combustion enclosure.
The genuine OEM B1392139 is molded to the exact panel cutout diameter so the view port seats snugly and the combustion door seals correctly. Generic grommets that are slightly off-size can fall out, vibrate, or compromise the sealed enclosure. Given the low cost, the exact-fit OEM part is the sensible choice.
A tool-free, snap-in replacement: press the old bushing out of the burner door and press the new one into the opening until it seats. No wiring, gas, or refrigerant work is involved. Confirm the view port is retained and the burner-compartment door closes and seals fully after installation.