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The Goodman B1392139 View Port Bushing is a genuine OEM fitting for the Goodman/Amana AMH80905CXCA 80% AFUE gas furnace and related models. This bushing (sight-port grommet) seats in the burner-compartment access hole and provides a clean, sealed opening through which a technician can visually inspect the burner flame during operation. Though small, it maintains the integrity of the combustion enclosure and keeps the sight port properly retained.
The OEM B1392139 is sized to the exact port diameter on this furnace cabinet, so it snaps in and stays put without falling out or leaving a gap. Generic grommets are rarely the right outside diameter and can work loose, allowing air infiltration at the burner box. For a proper, retained fit, use the factory part.
Very easy — A 2-minute, tool-free replacement. With the furnace off, pop the old bushing out of the access hole and press the new one into place until it seats. No fasteners or sealant required.
An inexpensive but easy-to-lose part — grab a spare while you're ordering. Genuine OEM fitting, ships fast.