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The Goodman B1392139 View Port Bushing is a genuine OEM component for the Amana AMH80804BXAA gas furnace and compatible Goodman/Amana models. This bushing seats in the sight-glass / view-port opening of the burner or combustion compartment, letting a technician observe the flame while maintaining the correct sealed opening. Though inexpensive, a missing or cracked bushing can allow air leakage around the port and interfere with proper combustion-compartment pressure.
The OEM B1392139 is molded to the exact port diameter so it snaps in and stays sealed. Off-the-shelf grommets rarely match the opening precisely and can fall out or leak under heat. At this price point, there is no reason not to use the correct factory part.
Easy — Under 5 minutes. With the furnace powered off and the burner door removed, pop out the old bushing and press the new one into the view-port opening until it seats fully. A simple, tool-free replacement.