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The Goodman B1392139 is a genuine OEM view port bushing (sight-glass grommet) designed for the AMH81205DXBA gas furnace and compatible Goodman/Amana models. This small but critical component seals the flame-observation port on the burner compartment, holding the sight glass securely while maintaining the combustion-chamber seal. A cracked or missing bushing can let combustion gases escape the viewing port, so replacing it with the exact OEM part keeps your furnace running safely and to spec.
The genuine Goodman B1392139 is molded to the precise diameter and temperature rating required for the burner-box port. Generic universal grommets often loosen, deform, or fail to seal at furnace operating temperatures, allowing air leaks that affect combustion. For a reliable, code-compliant repair, the OEM part is the recommended choice.
Easy — DIY friendly. Press-fit replacement with no tools required; typically installed in under five minutes with the furnace powered off. As with any gas-appliance service, ensure the unit is de-energized and the gas is shut off before opening the burner compartment.
Not sure this is the right part for your unit? Contact info@nationalhvacparts.com and we'll confirm fitment for your model.