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The Goodman B1392139 is a genuine OEM view port bushing (sight-glass grommet) for the AMS81155CXA gas furnace and compatible Goodman/Amana models. This small but important component seals the burner-compartment inspection port, allowing a technician to visually confirm flame quality and burner ignition while keeping the combustion chamber sealed against air leaks.
A cracked, melted, or missing view port bushing can allow air infiltration that affects combustion and draft, or simply obscures the inspection window. Replacing it with the correct OEM part restores a clean, sealed sight port.
OEM vs. Generic: The genuine Goodman bushing is molded to the exact bore diameter and thickness of the furnace panel opening for a snug, sealed press fit. Generic grommets are available at a lower cost, but diameter and heat rating can vary, risking a loose fit. For a proper seal, OEM is recommended.
Install Difficulty: Very Easy (1/5). Pop the old bushing out of the panel opening and press the new one in by hand—no tools required. Ensure power and gas are off before opening the furnace cabinet.