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The B1392139 is a genuine OEM view-port bushing (sight-glass grommet) for the Goodman WFD18090S4BXCC furnace. This small but important component seals the inspection port on the burner/heat-exchanger compartment, letting a technician safely observe the flame while keeping the combustion area sealed and rated. A cracked, brittle, or missing bushing can allow air leakage that affects flame stability and safe combustion.
Because it sits at the combustion inspection port, this bushing must hold its shape and seal under sustained heat. The OEM Goodman B1392139 is molded to the exact port diameter and rated temperature of the WFD18090S4BXCC. Generic rubber grommets may fit loosely or degrade quickly near the burner, so genuine OEM is strongly recommended for any part touching the combustion cabinet.
Easy. Snaps into the view-port opening by hand — typically a 5-minute job with no tools. Always shut off gas and power before opening the burner compartment.