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The B1392139 is a genuine OEM view port bushing (sight-glass grommet) for the Goodman/Amana AMVC80604BNBC gas furnace. It seats in the burner-compartment inspection port and provides a clean, sealed opening for viewing the flame during operation and diagnostics. A missing or brittle bushing lets combustion air and light leak past the port, which can disrupt flame sensing and pressure-switch readings.
The OEM bushing is molded to the exact port diameter for a snug, sealed press-fit. Generic grommets rarely match the port profile and can fall out or fail to seal, allowing air leakage. Choosing OEM guarantees a proper seal and correct fit the first time.
Easy — A tool-free press-in replacement that takes only a few minutes. Turn off furnace power, pop out the old bushing, and press the new one into the port.