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The Goodman 10254303 is a genuine OEM rubber coupling used in the GMH950453BXAB furnace's inducer and condensate/drain plumbing. This flexible coupling creates an airtight, water-tight seal between tubing sections, preventing flue-gas and condensate leaks that can trip pressure switches or cause corrosion. Rubber hardens and cracks with age and heat cycling, making this a common maintenance replacement on high-efficiency furnaces.
Genuine OEM rubber is molded to the exact inside diameter and durometer needed for a positive seal. Generic couplings that are slightly off-size can leak or slip, undermining the furnace's sealed combustion path. At this price, OEM is the sensible choice.
Very Easy (1/5) — Loosen the hose clamps, slide off the old coupling, and fit the new one. No tools beyond a nut driver; under 10 minutes.
Inspect adjacent tubing for cracks while you have the assembly open.