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The Goodman B1392139 is an OEM view port bushing for the WGFM28115V5CXAB gas furnace. This small grommet-style fitting seals the sight-glass / inspection opening on the burner compartment, letting technicians observe the flame while keeping the combustion area properly sealed against air leaks.
The OEM Goodman bushing is sized to the factory port diameter and rated for the temperatures near the burner box. Generic grommets may not seal fully or can degrade in heat, allowing air infiltration that disrupts combustion. For a proper seal, use OEM.
Very Easy (1/5). Press the old bushing out and the new one into the port opening — no tools required in most cases. A 5-minute job. Confirm the furnace is off and cool before reaching into the burner area.