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The genuine OEM Goodman B1392139 view port bushing seals the flame-inspection sight port on the AMH80904BXCB gas furnace. This grommet lets a technician watch the burner flame during startup while keeping combustion-air pressure and flue gases contained. A brittle or missing bushing can cause a pressure-switch fault, flame-sensing problems, or a small combustion leak, so it is worth replacing whenever it shows cracking or heat damage.
Genuine Goodman bushings are molded to the exact port diameter and rated for sustained burner-box heat, so they seal without deforming. Off-brand grommets often run undersized or use lower-temp compounds that shrink and fall out. The OEM part guarantees a leak-free, factory-correct fit.
Easy (DIY-friendly, under 5 minutes). Power down the furnace, pop the old bushing out of the panel, and press the new one into the port until it seats fully. No tools required.