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The Goodman B1392139 view port bushing is a genuine OEM part for the VCES960603BNAA gas furnace. It seals and trims the sight-glass/inspection opening on the burner or blower compartment, allowing technicians to visually check the flame while keeping the combustion area sealed against air leaks. A missing or degraded bushing lets air infiltrate the cabinet, which can affect burner performance, pressure readings, and combustion safety.
OEM vs. Generic: The genuine Goodman bushing is molded to the exact panel-hole diameter and thickness for a flush, airtight seal near the combustion area. Generic grommets rarely match the precise dimensions and may not tolerate the heat, so we recommend the OEM part for anything adjacent to the burner section.
Install difficulty: Very easy (1 of 5). Press the bushing into the port opening by hand with the furnace powered down and cool. Replacement takes under two minutes with no tools.