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The Goodman B1392139 View Port Bushing is a genuine OEM fitting for the WFM18070S4BXCC furnace. This small but important component seals and retains the sight-glass viewing port on the burner compartment, letting a technician safely observe the flame pattern during operation while keeping the combustion enclosure sealed. A missing or cracked bushing lets combustion air leak, can affect flame stability, and defeats the safety seal of the burner box.
Because this part sits on a heat-exposed combustion panel, the genuine Goodman OEM bushing is molded from a temperature-rated material sized to the exact port diameter. Universal grommets rarely match the bore and can deform or fall out under heat. At this price point there is no reason not to use the correct OEM part.
Easy. This is a simple press/snap-in fitting — remove the old bushing and seat the new one in the view-port opening by hand. No tools required in most cases. Disconnect power before opening any furnace panel.