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The B1392139 is a genuine Goodman view-port bushing, the molded grommet that frames and seals the burner-observation sight port on the Goodman DHS80704BXA furnace and related models. This small but important fitting lets a technician safely watch the flame during ignition and steady-state operation while maintaining the integrity of the combustion vestibule. A cracked, brittle, or missing bushing can allow air infiltration around the port and let heat degrade the surrounding panel over time.
It's an inexpensive, high-value part to replace whenever it shows heat discoloration or the retaining lip has hardened and split.
Because it must withstand vestibule heat and snap cleanly into a specific panel cutout, the genuine Goodman OEM bushing is the safe choice. Generic grommets rarely match the exact diameter or temperature rating and can fall out or deform. At this price, there's no reason to substitute.
Rating: Very Easy (1/5). A tool-free, snap-in replacement that takes under 5 minutes. Simply pop out the old bushing and press the new one into the port. Turn off power and gas before opening the burner compartment.