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The Goodman B1392139 is a genuine OEM view port bushing for the AMH80403AXAA gas furnace. This small molded fitting frames and protects the flame-observation (sight) port on the burner compartment, allowing safe visual inspection of the burner flame while sealing the opening against air infiltration and heat. Though inexpensive, a cracked or missing bushing lets combustion-zone air leak and can make flame observation difficult during service.
Because the bushing must snap into a specific port diameter and withstand sustained heat, the OEM B1392139 is the safe pick — it is molded to the exact port cutout and rated for the burner-box environment. Generic grommets rarely match the diameter and can deform or fall out under heat. For a part this affordable, OEM eliminates any fit guesswork.
Rated 1/5. With power off, press the old bushing out and snap the new one into the port. A two-minute job requiring no tools.