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The Goodman B1392139 is a factory-original view port bushing — the grommet/sight-glass ring that frames the burner observation window on the AMVC81005CXBD gas furnace. It seals the inspection port in the burner compartment door so you can safely watch the flame during a service check while maintaining the correct combustion-chamber pressure boundary. Over time the original bushing can dry out, crack, or fall out, leaving an open port that disrupts the sealed-combustion envelope. This OEM bushing restores a clean, tight fit.
The OEM B1392139 is molded to the exact port diameter so it snaps in and holds the sight glass without gaps. Generic grommets rarely match the bore and can work loose or fail to seal, compromising the sealed-combustion design. It's an inexpensive part — genuine OEM ensures a proper, lasting fit.
Very Easy — 1/5. No tools required in most cases. Cut power, pop the old bushing out of the port, and press the new one into place. A 2–5 minute job.