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The Goodman B1392139 is a genuine OEM view port bushing for the ACES960403BNAA gas furnace. It seats in the burner/combustion access opening to provide a sealed sight port for inspecting the flame and igniter during service. The bushing maintains the cabinet seal around the inspection window so combustion air pressure stays correct and flue gases can't escape, while still allowing a technician to confirm a clean, stable burner flame. A missing or melted bushing can cause air leaks, pressure-switch faults, and an unsafe inspection opening.
OEM Goodman uses the correct heat-rated material and outer diameter to seal the factory opening without deforming near the burner heat. Generic grommets often aren't high-temp rated and can shrink, melt, or fall out, breaking the cabinet seal. For a part this close to the burner, OEM is strongly recommended.
Very Easy (1/5). With power off, press the old bushing out and snap the new one into the view-port opening by hand. About a 2-minute job.