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The B1392139 is a genuine OEM view port bushing for the Goodman/Amana AMVC81155CXAB furnace. This small grommet seats in the burner-compartment door and holds the sight-glass window that lets a technician observe the burner flame during operation. A missing or degraded bushing can allow air leaks around the observation port and let the sight glass fall out.
Because the bushing must seal a small opening near the burner box and tolerate heat, the OEM B1392139 uses the correct material and outside diameter to snap securely into the factory door cutout. Generic grommets may be the wrong size or made of material that hardens and cracks. At this price point, the genuine OEM part is the obvious choice for a clean, sealed fit.
Very Easy (1/5). With the furnace off, press the old bushing out of the door and snap the new one into place — no tools required. Under five minutes. Reinstall the sight glass and confirm the observation port is fully seated.