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The Goodman B1392139 View Port Bushing is the genuine OEM grommet that retains and seals the burner-compartment sight glass on the ADSH800403AXAA furnace and compatible Goodman/Amana models. It lets a technician safely observe the burner flame through the door while keeping the combustion area sealed. A cracked, brittle, or missing bushing lets the view port leak air or fall out, disrupting the sealed-combustion airflow the furnace depends on.
This is a genuine OEM Goodman bushing molded to the exact diameter of the furnace door opening. Generic rubber grommets are unlikely to match the bore and flange and may not hold the sight glass securely. For a proper sealed fit, use the OEM part.
Very easy (1/5). Power off the furnace, pop out the old bushing, press the new one into the door opening, and reseat the sight glass. A 5-minute, no-tools repair.