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The genuine Goodman B1392139 View Port Bushing is the small but essential rubber sight-glass grommet that seals the flame-inspection port on ACSS960804CNAA gas furnaces. It holds the view-port lens in place, maintains the combustion-chamber seal, and lets a technician safely observe burner flame and ignition without opening the cabinet.
This is a factory OEM Goodman bushing engineered to the exact bore and durometer of the original. Generic substitutes often run slightly under-sized or use lower-temp rubber that hardens and cracks near the heat exchanger, breaking the seal. The OEM part guarantees a leak-free, drop-in fit the first time.
Easy (1 of 5). Power down the furnace, pop out the old bushing, and seat the new one in the view-port opening. No tools or wiring required — a 2-minute repair for any homeowner or technician.
Always disconnect power before servicing. Confirm fitment against your unit's parts list if you are unsure of the model.