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The Goodman B1392139 is a genuine OEM view-port bushing (sight-glass grommet) used on the ADSS800403AXAB furnace and compatible Goodman/Amana models. It lines the inspection opening in the burner compartment, allowing a clear, protected view of the flame during service while keeping the panel opening finished and secure. It's an easy-to-lose small part that's often needed after a burner or flame-sensor inspection.
The OEM B1392139 is molded to the exact port diameter so it snaps in and stays put. Generic grommets rarely match the opening and can fall out or fail to seat, leaving an unfinished port. Given the low cost, the factory part is the simplest fix.
Very easy (1/5). Press-fit into the view-port opening by hand — no tools required. A 5-minute replacement.