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The Goodman B1392139 is a genuine OEM view port bushing (sight-glass grommet) for the VMES961005CNAA gas furnace. It seats in the inspection opening so technicians can safely observe the burner flame while maintaining a proper seal against the heat-exchanger and combustion compartment. A cracked or missing bushing lets in drafts and can affect flame-sensing and combustion inspection.
The genuine Goodman OEM bushing is molded to the exact port diameter and rated for the furnace's operating temperatures. Generic grommets may not fit the port cleanly or withstand sustained heat, leading to premature cracking and air leaks.
Very Easy (1/5). A no-tool press-fit replacement. Power down the furnace, pop out the old bushing, and press the new one into the port until it seats. Typical time: under 5 minutes. Always shut off power and gas before servicing.