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The Goodman B1392139 is a factory-original view port bushing for the AMEC961004CNAB gas furnace. Mounted in the burner compartment door, it provides a clear sight port so technicians can visually inspect the burner flame and ignition without removing the panel, while sealing the opening against air leakage. A cracked or missing bushing lets in unwanted air and obscures flame inspection.
The OEM bushing matches Goodman's exact bore and panel thickness for a flush, sealed fit. A Generic grommet of the same diameter may substitute, but an imperfect fit can allow air infiltration.
Very Easy (1/5). Pop out the old bushing and press the new one into the door opening by hand. No tools required — under 2 minutes.