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The OEM Goodman B1392139 view port bushing is the genuine sight-glass grommet used on the Amana/Goodman AMH80803BNBB gas furnace. It seals the flame-inspection window on the burner compartment door, letting a technician visually confirm burner ignition and flame quality while keeping combustion air isolated. A missing or degraded bushing can create an air leak that upsets combustion or trips the pressure switch.
Because this bushing sits directly on the combustion enclosure, it must tolerate sustained heat cycling without shrinking or deforming. The OEM part is molded to the exact port dimension so it snaps in and stays sealed. Generic grommets often loosen or melt, causing rattles and combustion-air leaks. At this price point, the genuine part is the obvious choice.
A sub-5-minute, no-tool swap. Power the furnace off, pop the old bushing out of the door, and press the new one into the port until it seats flush. Reinstall the panel and verify a clear view of the flame on the next heat cycle.