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The Goodman B1392139 is a factory view-port bushing (sight-glass grommet) that seals the burner observation port on the furnace vestibule panel. It lets a technician safely watch the flame during service while keeping combustion air sealed. This is a direct OEM replacement for the ADVC80805CNBB furnace. A missing or brittle bushing allows air leakage and light spill that can affect combustion-air balance in the burner compartment.
The OEM B1392139 is molded to the exact port diameter and rated for the temperatures near the burner box. Generic grommets may not seal fully or can degrade quickly under heat, leading to air leaks. At this price point the genuine part is the obvious choice.
Under 5 minutes and no tools required. With power off, pop out the old bushing and press the new one into the panel opening until it seats fully. Confirm it sits flush and the port is sealed.
Genuine Goodman part, shipped fast from NationalHVACParts.com.