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The Goodman B1392139 is a genuine OEM view port (sight glass) bushing for the AMH80804BXBC gas furnace and compatible Goodman/Amana models. This small grommet-style bushing seats the burner observation window, letting a technician safely inspect flame quality while sealing the combustion chamber against air leaks that can disturb the flame pattern.
OEM vs. Generic: Because this bushing controls a combustion-chamber air seal, the OEM B1392139 is molded to the exact port diameter. Generic grommets rarely match the bore and can allow secondary air infiltration that affects flame stability — the genuine part is the safe, low-cost choice.
Install difficulty: Easy — press-fit into the burner box port with no tools required. Shut off gas and power before opening the furnace.