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The Goodman B1392139 is a genuine OEM view-port bushing (sight-glass grommet) used at the burner inspection window on the ACEC800603AXAA and compatible Goodman/Amana furnaces. This small but important part seals the viewing port so the combustion chamber maintains correct pressure while still letting a technician observe flame quality during service.
OEM ensures an exact diameter so the bushing snaps in and seals without falling out or distorting the sight glass. Generic grommets in the wrong size leak air, disturb the burner draft, and can melt if not rated for the port's heat exposure. The genuine part is inexpensive insurance.
One of the simplest repairs on the furnace. With the power off and the burner cool, push the old bushing out, clean the opening, and press the new bushing into place by hand. Under 10 minutes, no tools required. Verify it seats fully and flush around the entire rim.