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The Goodman B1392139 is a genuine OEM view port bushing for the AMVC80805CXBA furnace and other Goodman & Amana models that use a sealed burner-observation port. This small grommet seats in the burner-compartment door and holds the sight glass while sealing the opening, letting you observe the burner flame without breaking the cabinet's air seal.
A hardened, brittle, or missing bushing can cause an air leak that upsets combustion air balance and may trigger flame-sensing or pressure-switch faults. This inexpensive OEM part restores a proper seal around the viewing port.
OEM vs. Generic: The OEM bushing is molded to the exact port diameter and uses a temperature-rated compound that resists the heat near the burner box. Generic grommets frequently run undersized or use a lower-temp material that shrinks and falls out. At this price, OEM is the obvious choice.
Install difficulty: Very easy (1/5). With power off, pop out the old bushing from the burner door and press the new one into place until it seats. A 5-minute job, no tools required.