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The Goodman 10254303 Rubber Coupling is a genuine OEM sealing component for the GMV90905CXBA high-efficiency condensing furnace and compatible Goodman/Amana models. In 90%+ AFUE furnaces the flue gases cool enough to produce condensate, and flexible rubber couplings create a leak-free, vibration-tolerant seal between drain, trap, and inducer connections. A cracked or hardened coupling is a common cause of water leaks and pressure-switch faults.
The OEM coupling is molded to the precise diameter and durometer required for a positive seal on your furnace's specific fittings. Generic rubber couplings may be slightly off-size, leading to slow leaks that corrode nearby components. For condensate-side reliability, OEM is the safer choice.
Very Easy (1/5) — Loosen the retaining clamps, slide off the old coupling, and press the new one into place. No tools beyond a nut driver required. Power and gas off before servicing.