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The Goodman B1392139 View Port Bushing is a genuine OEM grommet-style fitting that frames the flame-inspection sight port on your Goodman ADVC80905CXAA furnace. This bushing seals the viewing opening and protects the surrounding sheet metal, helping maintain proper combustion-chamber pressure and a clean line of sight to the burner flame during service checks.
The OEM Goodman bushing is molded to the exact port diameter so it snaps in flush and holds its seal at furnace operating temperatures. Generic grommets may be the wrong bore size, fall out, or degrade under heat — allowing air leaks that can affect burner performance. This is an inexpensive part where genuine fit matters.
Easy. This is a snap-in replacement that takes only a few minutes with no tools required. Shut off power and gas, remove the old bushing from the inspection port, and press the new one into place until seated. A great DIY repair.