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The Goodman B1392139 View Port Bushing is the genuine OEM grommet that seals the combustion sight-glass opening on the furnace vestibule panel, letting you safely observe burner flame while maintaining a proper air seal. It is an exact-fit replacement for the Amana / Goodman AMV81155CXBB and related furnaces.
Though inexpensive, this bushing plays a real role in maintaining the sealed combustion path. A genuine OEM part fits the port tightly and withstands vestibule heat, where a loose generic grommet can fall out or leak, disrupting the induced-draft pressure the furnace depends on.
A 5-minute, tool-free job. Pop out the old bushing, seat the sight glass in the new bushing if applicable, and press the assembly firmly into the port until it snaps flush. No power-down strictly required, though shutting the furnace off first is good practice.