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The Goodman 10254303 Rubber Coupling is a genuine OEM seal used on GCH950905DXAA high-efficiency gas furnaces. This flexible rubber coupling connects condensate drain and hose sections at the trap or inducer assembly, creating a leak-tight, vibration-absorbing joint. A cracked or hardened coupling lets condensate weep out, which can cause water damage, corrosion, and pressure-switch faults.
The OEM coupling is molded to the exact inner diameter and wall thickness for the GCH950905DXAA drain path, so it slips on and clamps without gaps. Generic hardware-store couplings may be the wrong bore or a rubber compound that hardens quickly around warm condensate, leading to repeat leaks. The genuine part is inexpensive insurance against water damage.
Very Easy (1/5). Slip the coupling over the fittings and secure the clamps. Power down the furnace, clear any standing condensate, and confirm a snug, drip-free fit.