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The Goodman B1392139 View Port Bushing is a genuine OEM sight-glass grommet used on the AMH81005CXAA gas furnace and compatible Goodman/Amana models. This small rubber-and-plastic bushing seals the flame-observation port on the burner box, holding the sight glass in place while preventing air leaks that could disrupt combustion airflow and flame sensing. A cracked, brittle, or missing bushing is a common cause of a whistling burner compartment or a loose view port cover.
This is the genuine Goodman OEM part, molded to the exact diameter and temperature rating of the original. Generic universal grommets are cheaper but frequently sit loose or degrade near the burner's heat, breaking the port seal. For a $7 part that guards combustion integrity, OEM is the smart choice.
Easy (1/5). Cut power to the furnace, remove the old bushing from the port, press the new one into place, and reseat the sight glass — a five-minute job with no tools required. Always shut off gas and power before servicing.