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The Goodman B1392139 View Port Bushing is a genuine OEM grommet that seals the burner-box inspection (sight) port on the AMH81005CXBD furnace. It lets technicians visually confirm flame and burner ignition while maintaining a proper seal against the combustion chamber, preventing air leaks that could disrupt the burner flame pattern.
OEM vs. Generic: Though inexpensive, this bushing sits at the combustion chamber and must handle heat and provide a snug seal in the factory opening. The OEM B1392139 is molded to the exact port diameter of the AMH81005CXBD. A mismatched generic grommet can fall out, melt, or leave a gap that lets the flame draw combustion air unevenly. Always use the OEM part here.
Install Difficulty: Easy (1 of 5). With power off, push the old bushing out of the view-port hole and press the new one into place until it seats fully. Under 5 minutes and no tools required. Verify it sits flush around the entire opening before restarting the furnace.