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The Goodman/Amana B1392139 view port bushing is a factory OEM component for the AMVC80604BXBD 80% AFUE gas furnace. This bushing frames the sight-glass / burner observation port on the burner compartment, allowing a technician to safely view flame ignition and burner operation while sealing the opening against air leakage and heat. A cracked or missing view port bushing can pull in combustion air and skew the burner air/fuel balance.
Genuine B1392139 is molded to the exact diameter of the AMVC80 port so it snaps in and seals flush. Generic bushings are rarely sized correctly and can fall out or leak, disturbing burner airflow. At this price point, the OEM part is the obvious choice.
Rating: Easy. This is a simple snap-in replacement. Power the furnace down, pop out the old bushing, and press the new one into the port opening. No tools or special skills required — typically a 5-minute job.
Confirm the part number on your unit before ordering.