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The OEM Goodman B1392139 is the sight-glass view-port bushing (grommet) used on the Goodman/Amana AMH80903BNAC gas furnace and compatible models. This small but essential component seals the inspection port on the burner/vestibule panel, allowing technicians to observe flame ignition and burner operation while maintaining a proper draft seal on the combustion compartment.
A correct seal at the view port matters more than its price suggests — a loose or ill-fitting generic grommet can allow air infiltration that disturbs draft and flame sensing. The OEM B1392139 is molded to the exact port diameter for a snug, heat-rated fit that keeps the combustion compartment properly sealed.
Very Easy (1/5). The bushing presses into the panel opening by hand in seconds — no tools required. Power down the furnace, remove the old bushing, and seat the replacement flush in the port. A quick, inexpensive part to keep on hand during any furnace service.