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The genuine OEM Goodman B1392139 view port bushing is the grommet that seals the burner-compartment sight window on the Goodman/Amana AMH80603ANBA gas furnace. It lets a technician safely observe the flame and igniter through the door while keeping the combustion chamber sealed against air leaks. Over time these bushings dry out, crack, or fall out, allowing combustion-air disturbance and light leakage — replacing it restores a clean, factory-tight seal.
OEM vs. Generic: Because this bushing seats in a precise opening in the burner box, the OEM B1392139 is molded to the exact diameter and durometer needed for a snug, heat-stable fit. Generic grommets are inexpensive but rarely match the bore, so they can pop out or fail to seal. For proper combustion-chamber integrity, use the genuine Goodman part.
Install difficulty: Very easy (1 of 5). With the furnace off, pop out the old bushing and press the replacement into the view-port opening by hand. No tools needed — under five minutes.