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The genuine Goodman B1392139 View Port Bushing is a small but exact OEM fitting for the Goodman WGFM28090V5CXAA gas furnace. It seats into the sight-glass / view port opening on the burner or blower compartment, providing a clean grommet through which the flame can be observed while sealing the panel opening against air leakage. A missing, brittle, or melted bushing lets conditioned air and combustion draft escape and can allow the sight glass to rattle loose.
Because it snaps into a specific panel cutout and must tolerate the heat near the burner box, the diameter and material grade matter. The OEM B1392139 is molded to the exact port size for a tight, heat-rated seal. Generic grommets in the wrong size either fall out or won't seat, and non-rated rubber can deform near the burners. At this price, the factory part is the obvious choice.
A 2–5 minute job. With the furnace powered off and cool, pop out the old bushing and press the new one firmly into the port opening until it snaps flush. No tools required.