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The genuine Goodman B1392139 View Port Bushing is the OEM grommet that frames and seals the burner sight-glass / view-port opening on the Goodman/Amana ACSS960402BNAA 96% AFUE gas furnace. It provides a clean, finished edge around the inspection port and helps maintain the cabinet's combustion-air seal so technicians can safely observe the burner flame.
OEM vs. Generic: The B1392139 is sized to your furnace's exact view-port cutout, so it snaps in flush and holds the seal. A mis-sized generic bushing can fall out or compromise the cabinet seal, affecting combustion-air balance and flame observation. For a proper-fitting, heat-rated seal, choose the OEM part.
Install Difficulty: Very Easy (1/5). A 2-minute, no-tools job. With the furnace powered off, press the old bushing out of the panel opening and snap the new B1392139 into place until the retaining lip seats fully around the port. Confirm it sits flush before returning the unit to service.