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The Goodman B1392139 is a genuine OEM view-port bushing (sight-glass grommet) for the AMSS960804CNAA furnace. It lines the observation opening on the burner/blower access panel, providing a clean, sealed window to inspect the flame and ignition sequence without removing the door. A cracked or missing bushing lets air leak past the panel and can distort the sight opening — this replacement restores a proper seal and a clear view port.
The OEM bushing matches the exact panel cutout so it snaps in flush and seals against air bypass. The Generic equivalent fits common openings at a lower price; choose OEM for a guaranteed factory-flush seal.
Very Easy (1/5). Pop out the old bushing and press the new one into the panel cutout until it snaps home. Typical time: under 2 minutes, no tools required.