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The B1392139 is a genuine OEM view-port bushing for the Amana AMH80805CNBA gas furnace. This bushing seats in the burner-compartment observation opening, providing a heat-resistant seal around the sight port used to visually check the burner flame. A missing or deteriorated bushing can allow air leakage that affects combustion draft and lets flame light escape the cabinet.
This is a molded-to-fit OEM component sized precisely for the furnace's view-port opening. There is no reliable universal substitute — an ill-fitting grommet can fall out during operation or fail to seal the cabinet.
Power off, press the bushing into the view-port opening until it seats fully. No tools required. Typical time: 5 minutes.