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The Goodman B1392139 View Port Bushing is a genuine OEM grommet that seals the sight-glass/inspection opening on the burner compartment of the VMS80403ANAA gas furnace and compatible Goodman/Amana 80% AFUE models. This small but critical fitting keeps the burner box air-tight so the flame-viewing port doesn't leak combustion air, which can otherwise cause flame roll-out, nuisance pressure-switch trips, and inaccurate flame-sensor readings.
This is a factory Goodman OEM part guaranteed to match the original diameter and heat rating. Generic aftermarket grommets are cheaper but often shrink, harden, or fall out at furnace operating temperatures, breaking the burner-box seal. For a component this inexpensive, OEM is the right call.
Easy (1/5). Push-fit replacement — no tools required. Power down the furnace, pop out the old bushing, and press the new one into the port. A typical replacement takes under two minutes. Always shut off gas and power before servicing.