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The Goodman 10254303 Rubber Coupling is a genuine OEM sealing component for the WGFM195070S4CAB high-efficiency gas furnace. This flexible coupling joins drain, condensate, or inducer/trap connections and forms a leak-tight, vibration-tolerant seal between mating tubes. On a condensing furnace even a small drip at these joints leads to water in the burner compartment, nuisance pressure-switch faults, and long-term corrosion — so a correctly sized coupling matters more than its low price suggests.
OEM vs. Generic: The OEM 10254303 is molded to the precise inside diameter and wall thickness of this furnace's fittings, so it seats fully and clamps evenly. Generic hardware-store couplings are often the wrong durometer or bore and can weep under thermal cycling. For a sealing part, exact fit is the whole job.
Install difficulty: Easy (1/5). Power the furnace down, slide off the old coupling (loosen the clamp if fitted), press the replacement fully onto both stubs, and re-clamp. A 5–10 minute job. Confirm there is no residual water in the trap and check for drips after the first heat cycle.