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The B1392139 is a genuine OEM view port bushing (sight-glass grommet) for the Goodman/Amana ADVC80805CXBA gas furnace. It seats in the burner-compartment access opening, providing a clean, heat-resistant seal around the sight port used to observe burner flame. A missing or degraded bushing can allow air leakage around the port and affects the tight seal the sealed-combustion cabinet depends on.
This is a small but purpose-molded part sized to the furnace's exact port diameter and rated for burner-area heat. A generic grommet may not seal fully or may degrade under temperature. The genuine B1392139 ensures a proper, lasting fit for your ADVC80805CXBA.
Very Easy (1/5). A press-in part requiring no tools. Remove the old bushing and firmly seat the new one into the port opening until it snaps flush.