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The Goodman B1392139 is a genuine OEM view port bushing for the ACSS961205DNAA gas furnace. This bushing lines the sight-glass opening that lets a technician visually inspect the burner flame and ignition during service. It protects the edges of the cabinet opening, holds the view port window securely, and helps maintain the cabinet seal around the inspection area.
This OEM bushing is dimensioned to match the factory view port cutout exactly, ensuring the sight glass seats flush and the opening stays sealed against flue gas and air leaks. Substitute parts rarely match the precise diameter, risking a loose window or compromised seal. The genuine component is strongly recommended.
Very Easy — A 5-minute replacement. Remove the old bushing from the view port opening, press the new bushing into place, and reseat the sight-glass window. No special tools required.