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The Goodman B1392139 View Port Bushing is the OEM sight-glass grommet for the AMVC800804CXAB gas furnace and compatible Goodman/Amana models. This bushing seals the observation port on the burner or blower compartment, allowing the flame or interior to be inspected while maintaining the correct compartment seal for proper combustion-air pressure and safe operation. Cracked, brittle, or missing bushings can leak air, distort flame sensing, and let dust into the cabinet.
Because this bushing seals a pressure-sensitive compartment, the exact outer diameter and flange thickness matter. The genuine Goodman B1392139 snaps into the factory opening for a tight, heat-resistant seal. Generic grommets rarely match the port dimensions and can fall out or degrade near the heat exchanger.
Easy (1/5). No tools required in most cases — pop out the old bushing and press the new one into the port opening. A 5-minute replacement. Power down the furnace and let the cabinet cool before servicing.