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The Goodman B1392139 View Port Bushing is a genuine OEM fitting for the ADSS800804BXAD gas furnace and compatible Goodman/Amana models. This small but important bushing secures and seals the combustion-chamber sight-glass (view port), allowing safe visual inspection of the burner flame while keeping the combustion area sealed. A cracked or missing view-port bushing can allow air leakage and makes flame observation difficult during service.
OEM vs. Generic: The genuine B1392139 is molded to the exact diameter and high-temperature spec required for the view-port opening. Substitute bushings may not seat correctly or withstand combustion-area heat, risking leaks and premature failure.
Install Difficulty: Easy — press the old bushing out and the new one into the view-port opening after cutting power. A quick 5–10 minute replacement, ideal to swap while performing other burner-area service.