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The Goodman B1392139 View Port Bushing is the genuine OEM sight-glass bushing that seats in the burner compartment access/inspection port of AMV80704BXBA gas furnaces. It lets a technician observe flame and ignition while sealing the port against air leakage. A cracked, brittle, or missing bushing lets in ambient air that can disturb flame sense and combustion — this OEM part restores a proper seal.
OEM vs. Generic: The OEM bushing is molded to the exact port diameter and rated for burner-compartment temperatures. Generic grommets may not seal fully or may degrade in heat, leading to air leaks and nuisance faults. For a combustion-area seal, OEM is the safe choice.
Install Difficulty: Very Easy (1/5). Power off, pop the old bushing out, and press the new one into the port. Under 5 minutes, no tools required.