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Keep the burner-observation sight port properly sealed on your Amana AMVC800604BNAB furnace with the genuine Goodman B1392139 view port bushing. This small but important component surrounds the flame-viewing port, sealing the opening against air infiltration while providing a clean, protected window to observe burner ignition and flame quality during service. A cracked or missing bushing lets combustion air leak past the port, which can affect burner performance and flame appearance.
Because it seals an opening in the combustion vestibule, the bushing must fit the port diameter exactly and tolerate sustained heat. Generic rubber grommets harden, shrink, or melt near the burner box. This factory OEM bushing is molded to the precise port dimensions and rated for the temperatures found at the furnace sight glass.
One of the simplest furnace repairs — usually under 5 minutes. With power off, pop the old bushing out of the view-port opening and press the new one firmly into place until it seats fully around the panel edge. No tools required. It's smart to replace this inexpensive part any time the burner compartment is opened for other service.