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The Goodman 10254303 Rubber Coupling is a genuine OEM sealing component for the Goodman GKS90453BXAA gas furnace. This flexible coupling forms a leak-tight connection in the condensate drain and induced-draft/vent assembly, absorbing vibration and thermal movement while preventing water and flue-gas leaks. A cracked or hardened coupling is a common cause of drain drips and pressure-switch faults, so replacing it with the correct OEM part restores reliable operation.
The genuine coupling is molded to the exact inside diameter and durometer Goodman specifies, so it seals correctly and resists condensate acidity. Off-brand rubber can be too stiff or too soft, leading to slow leaks or blow-off under draft pressure. At this price point, there is no reason not to use the OEM seal.
Very Easy (1/5). Typically a 5-minute, no-tools swap — slide the old coupling off and the new one on, seating it fully on both fittings. Power down the furnace first and check for leaks after restarting.