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The Goodman 10254303 Rubber Coupling is a genuine OEM sealing component for the Goodman GKS90453BXAB high-efficiency gas furnace and compatible GKS90-series models. This flexible rubber coupling joins condensate drain or trap connections and provides a watertight, vibration-tolerant seal between components. Over time rubber couplings harden, crack, or lose elasticity, leading to condensate drips, pressure-switch faults, and potential water damage — making this an inexpensive but important maintenance replacement.
The genuine Goodman coupling is sized to the exact inner and outer diameters of the GKS90 drain ports, delivering a snug, leak-free seal. Generic rubber couplings from a hardware store may be close but rarely exact, and an imperfect fit on a condensate path invites slow leaks that are hard to trace. At this price, the correct OEM part is the smart choice.
Easy (1 of 5). Power down the furnace, slide off the old coupling (loosen any hose clamps first), clean the mating surfaces, and press the new coupling into place. Re-tighten clamps and check for leaks after restarting. A quick 5–10 minute repair requiring no special tools.