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The Goodman B1392139 View Port Bushing is a genuine OEM component for the WFM18115S5CXCB gas furnace. This small but important part frames and seals the combustion sight-glass / inspection port on the burner compartment, allowing safe visual confirmation of flame and igniter operation while maintaining a proper seal against the vestibule panel.
Because it seats directly against the burner-box panel, the OEM B1392139 is machined to the exact port diameter for a flush, leak-free fit. Generic substitutes rarely match the opening and can allow flue-gas leakage or a loose sight glass. At this price point, OEM is the clear choice.
Very Easy (1/5). With power and gas off, pop out the old bushing and press the replacement into the port opening. A 5-minute job requiring no tools.