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The Goodman B1392139 View Port Bushing is a genuine OEM grommet that frames and seals the flame-viewing sight port on the VCES960403BNAA gas furnace. This bushing lets a technician safely observe the burner flame while maintaining the seal of the combustion chamber. A missing, melted, or brittle bushing allows air infiltration around the port, which can affect combustion draft and pressure-switch behavior — the factory part restores a clean, heat-resistant seal.
The OEM Goodman bushing is sized to the exact bore of the furnace's viewing port and rated for the heat near the combustion area. Generic grommets may not tolerate the temperature and can shrink or harden, breaking the seal. At under a dollar, there is no reason not to use the correct OEM part.
Very Easy (1 of 5). Under 5 minutes with no tools — power down the furnace, pop out the old bushing, and press the new one into the port until it seats flush. An inexpensive part worth replacing any time the burner compartment is accessed.