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The Goodman B1392139 is a genuine OEM view port bushing (sight-glass grommet) for the AMS80704BXA gas furnace and compatible Goodman and Amana equipment. This small but essential component seals the burner inspection port on the combustion cover, letting a technician safely observe the burner flame while keeping the combustion chamber properly sealed. A missing or degraded bushing can cause air leaks that disturb the flame pattern and trigger pressure-switch or flame-sensing faults.
OEM vs. Generic: The genuine B1392139 is molded to the exact port diameter and heat rating of the original, ensuring a tight, lasting seal. Generic grommets often fit loosely or harden and shrink near the combustion area, breaking the seal and inviting the very air leaks this part is meant to prevent.
Install difficulty: Easy (DIY-friendly). The bushing simply presses into the port opening — no tools required beyond removing the burner cover. Shut off power and gas first, seat the new bushing fully, and confirm it sits flush for a complete seal. If you notice flame disturbances or combustion issues afterward, consult a licensed HVAC technician.