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The Goodman B1392139 is a genuine OEM view-port bushing for the AMS80403AXAD gas furnace and compatible Goodman/Amana models. This bushing secures the combustion sight-glass / view port on the burner compartment, letting a technician safely observe the flame while keeping the burner box sealed against air leaks.
Over years of heat cycling the original bushing can shrink, crack, or fall out, allowing air infiltration that disturbs the flame and can trip flame-sensing faults. Fitting a fresh OEM bushing restores a clean, sealed viewing port.
The factory Goodman bushing is molded to the exact port diameter so it snaps in and stays put under heat. Generic bushings frequently loosen or melt at burner-box temperatures. This small part protects combustion integrity, so genuine OEM is the smart choice.
Very Easy (1/5). With the furnace powered off and the burner cover removed, push out the old bushing and press the new one into the port opening by hand. No tools required in most cases; a 5-minute replacement.