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Replace a cracked or missing sight-glass seal with the genuine OEM B1392139 view port bushing for the Goodman ADSS800603AXAC furnace. This bushing seats in the burner-compartment observation port, holding the sight glass and maintaining a sealed combustion area so you can safely observe the burner flame without allowing air leaks into the burner box.
The OEM Goodman bushing is molded to the precise port diameter for a snug, heat-resistant seal. Generic grommets rarely match the opening and can loosen or degrade near the burner. For a small part that maintains combustion integrity, OEM is the safe choice.
Very Easy — press the bushing into the view port by hand, under 5 minutes. No tools required; power down the furnace first.