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The Goodman 10254303 rubber coupling is a genuine OEM sealing component for GKS90905DXAA gas furnaces and compatible Goodman/Amana models. This flexible molded coupling joins and seals pipe or tubing connections — typically on the induced-draft/vent or condensate drain path — absorbing vibration while keeping the joint air- and water-tight. A cracked, hardened, or split coupling can cause pressure-switch faults, flue-gas leaks, or water dripping around the furnace base.
The OEM coupling is molded to the exact inside diameter and durometer Goodman specifies, ensuring a leak-free seal without over-clamping. The Generic equivalent fits the same dimensions at a lower cost — a fine choice for routine out-of-warranty maintenance. Replace couplings whenever they feel stiff or show cracks.
Very Easy (1/5). Loosen the hose clamps, slide off the old coupling, seat the new one, and re-tighten evenly. No tools beyond a nut driver required. Confirm no leaks after startup.