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The Goodman B1392139 View Port Bushing is a genuine OEM fitting for the Amana/Goodman AMSS960603BNAA 96% AFUE gas furnace. It seats around the combustion sight-glass (view port) opening, sealing the burner compartment while giving the technician a safe window to observe the flame during ignition and diagnostics. A cracked or missing bushing lets air leak into the sealed combustion path and can cause flame-sensing and pressure faults.
OEM vs. Generic: The OEM B1392139 matches the factory bore and flange so it seals the view port without air leaks and withstands the heat near the burners. Generic grommets rarely hold up to the temperature or fit the opening precisely, risking a combustion-air leak. For a sealed, safe burner compartment, choose the OEM bushing.
Install difficulty: Very Easy (1/5). Power down the furnace, press the old bushing out of the view-port opening, and snap the new one into place by hand. No tools required; under 5 minutes.