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The Goodman B1392139 is a genuine OEM view port bushing (sight glass grommet) engineered for the AMVC801005CXAB and compatible Goodman/Amana gas furnaces. This small but essential rubber grommet seats the flame-viewing sight glass in the burner compartment door, sealing the opening so the induced-draft pressure and combustion air path remain correct while still allowing a technician to visually inspect the burner flame during startup and service.
A cracked, brittle, or missing view port bushing can cause a combustion-air leak, nuisance pressure-switch faults, and lockouts. Replacing it with the exact factory part restores a clean seal and safe operation.
This is the genuine OEM Goodman component, molded to the exact bore and thickness the furnace door was designed for. Generic universal grommets often sit loose or degrade quickly under burner-box heat, leading to repeat air leaks. The OEM part guarantees a proper seal and full compatibility with Goodman's combustion design.
Installation is straightforward — with power and gas off, remove the old bushing from the sight-glass opening and press the new B1392139 into place. Typical replacement takes under 10 minutes with no special tools. As with any furnace repair, confirm the unit is de-energized before servicing.