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The Goodman B1392139 is a genuine OEM view-port bushing (sight-glass grommet) for the Amana/Goodman AMH80603AXBC gas furnace and related 80% AFUE models. It mounts in the burner-compartment door or heat-exchanger panel to hold the flame-observation window and keep the combustion area properly sealed.
A brittle or missing bushing allows air leakage around the view port, which can affect burner performance and makes it hard to safely inspect the flame. This exact-fit replacement snaps back into the factory opening for a clean, secure seal.
OEM vs. Generic: The genuine Goodman bushing is molded to the precise diameter of the factory port so it seats flush and stays put. Generic grommets often fit loosely or degrade with heat exposure, leading to rattles and air leaks.
Install difficulty: Very easy (1/5). Power down the furnace, pop out the old bushing, and press the replacement into the port by hand — no tools required, under 5 minutes.