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The Goodman 10254303 Rubber Coupling is a genuine OEM flexible connector used to join drain, condensate, or vent tubing on the GKS90904CXAH high-efficiency gas furnace and related Goodman/Amana models. The pliable rubber body absorbs vibration and forms a leak-tight seal at slip connections, preventing condensate weeping that can corrode furnace components or trigger pressure-switch faults.
The OEM coupling is sized to the precise inner and outer diameters of the furnace's factory tubing, giving a snug fit with no shimming or clamps beyond spec. Generic couplings often run loose or stiff, leading to slow leaks or split fittings over time. At this price point, the genuine part is the sensible choice.
Easy — a true DIY part. Slide the old coupling off, clean the tubing ends, and press the new coupling into place; secure with the original clamps if used. Typically under 10 minutes with no tools. No electrical or gas work involved.