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The Goodman B1392139 View Port Bushing is the OEM grommet/fitting that lines the flame sight-port opening on the ACES800403ANAA furnace and compatible Goodman and Amana gas furnaces. It seals the inspection window in the burner compartment so you can safely watch the flame while keeping the combustion area airtight. A brittle or missing bushing can allow air leakage and disrupt the pressure switch and flame pattern.
The factory B1392139 is molded to the exact diameter of the cabinet port so it snaps in flush and stays sealed at burner temperatures. Generic rubber grommets can shrink, melt, or fall out near the combustion zone. For a small, inexpensive part on a safety-critical opening, the OEM bushing is the smart pick.
Easy — about 5–10 minutes. With the furnace powered off, pop the old bushing out of the sight-port hole and press the new B1392139 firmly into place until it seats. No tools required. As always, allow the furnace to cool before servicing the burner area.