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The Goodman B1392139 is a genuine OEM view-port bushing (sight-glass grommet) designed for the ACVC80603BXBD gas furnace. It seats in the burner/inducer inspection opening, providing a clean, sealed pass-through that lets technicians visually verify flame and inducer operation while keeping the combustion area sealed against air leaks. A missing, brittle, or cracked bushing can cause an improper combustion-air seal and nuisance pressure-switch faults.
The OEM B1392139 is molded to the precise diameter and durometer needed to seal the inspection port and withstand combustion-area heat. Generic grommets often loosen, melt, or leak, undermining the furnace's sealed-combustion design. For a few dollars, OEM eliminates guesswork.
Easy — Power down the furnace, pop the old bushing out of the port, and press the new one into place by hand. No tools required; under 10 minutes.