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The Goodman B1392139 View Port Bushing is the factory sight-glass grommet that seals the burner-compartment inspection window on the GSU080-4 and related Goodman gas furnaces. It lets a technician safely observe the burner flame and ignition sequence without removing panels, while keeping the combustion chamber properly sealed against air leakage.
The genuine Goodman OEM bushing is molded to the exact port diameter, so it seats flush and maintains the correct combustion-chamber seal. Universal grommets often leak air or fall out under heat cycling, which can affect flame stability. For a $1 part, OEM is the sensible choice.
Easy (1/5). No tools required — power down the furnace, press the old bushing out, and snap the replacement into the view port. A 5-minute job for any homeowner or technician.
All Goodman OEM parts ship fast and are backed by our fit guarantee.