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The genuine OEM Goodman B1392139 View Port Bushing is the factory grommet/bushing that frames and seals the burner sight-glass (view port) opening on the Amana/Goodman AMSS960805CNAA gas furnace. The view port lets a technician visually confirm burner flame quality during service, and the bushing keeps that opening sealed against air leaks and combustion-gas escape while protecting the surrounding sheet metal. A cracked or missing bushing can allow air infiltration that affects combustion and pressure-switch behavior.
Generic grommets rarely match the furnace's port diameter and can shrink or harden near the burner's heat, breaking the seal. The OEM B1392139 is spec'd for the temperatures at the burner box and seats precisely in the factory opening for a lasting, airtight fit.
Very Easy (1 of 5). Under 5 minutes — power down the furnace, press the old bushing out, and snap the new one into the port. No special tools. Because this part sits near the burners, always have a licensed HVAC technician handle the replacement and verify flame quality afterward.