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The Goodman B1392139 View Port Bushing is the genuine OEM grommet that seats the sight-glass window on the AMVC80805CXBB two-stage variable-speed gas furnace. It seals the burner inspection port so the flame can be observed safely while keeping the combustion chamber pressure-tight. A cracked, brittle, or missing bushing is a common cause of a loose or rattling view port cover and minor combustion-air leaks.
The OEM B1392139 is molded to the exact port diameter and temperature rating specified by Goodman, so it seats flush and holds its seal through repeated heat cycles. Generic universal bushings are cheaper but often run oversized or use a lower-temp compound that hardens and drops out. For a small, safety-adjacent combustion part, the OEM piece is the reliable choice.
Rated Easy (1/5). Power down the furnace at the switch/breaker, pop the old bushing out of the port, press the new one into place, and reseat the cover. No tools or gas-line work required. If you are unsure about any combustion-side service, have a licensed HVAC technician confirm the repair.