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The B1392139 is a genuine OEM view port bushing for the Goodman/Amana AMH80403ANBD gas furnace. This small grommet seats in the burner-compartment sight-glass opening, letting a technician safely view the burner flame while keeping the combustion chamber sealed against air leaks. A missing or brittle bushing can let secondary air into the burner box and affect flame quality.
The OEM bushing is sized to the exact port diameter so it snaps in and stays put under heat. Generic grommets tend to shrink or fall out over time. Given the low cost, OEM is the clear choice.
Very easy — press the bushing into the view port opening by hand in under 5 minutes. Turn off power and gas before opening the burner compartment.