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The Goodman 10254303 Rubber Coupling is a genuine OEM sealing component used in GKS90904CXAA high-efficiency gas furnaces. This flexible coupling connects and seals condensate drain, inducer, or pressure-tubing junctions, maintaining an airtight and watertight bond between components. Over years of thermal cycling, rubber couplings can harden, crack, or leak — leading to pressure-switch faults, condensate leaks, or nuisance lockouts. Replacing a worn coupling with the correct OEM part restores proper drainage and combustion-air sealing.
OEM vs. Generic: Couplings are inexpensive, so there is little reason to gamble on a generic that may not match the exact inside diameter or durometer. An improperly sized aftermarket coupling can leak or slip off, causing recurring service calls. The OEM 10254303 fits precisely the first time.
Install Difficulty: Very easy — a 5–10 minute replacement requiring no special tools. Turn off power to the furnace, slide off the old coupling, and press on the new one. A great low-cost part to keep on hand during any furnace tune-up.