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The Goodman 10254303 is a genuine OEM rubber coupling used in the GKS90904CXAC gas furnace. This flexible coupling seals and connects sections of the venting or condensate/inducer assembly while absorbing vibration, preventing air and combustion-gas leaks that would otherwise trip pressure switches or reduce efficiency.
Genuine Goodman rubber couplings are molded to the exact diameter and durometer required for a leak-free seal on your furnace's tubing. Universal couplings often have the wrong inside diameter or degrade quickly under heat, leading to slow leaks and intermittent pressure-switch faults. At this price point, replacing with OEM is the smart choice.
Easy. With power off, loosen the retaining clamps, slide off the old coupling, and fit the new one over the tubing before re-tightening the clamps. A common wear item replaced during routine furnace service — no special tools required.