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The Goodman 10254303 Rubber Coupling is the genuine OEM flexible seal used to join condensate/drain and induced-draft components on GCH950904CXAA 95% AFUE furnaces. A cracked or hardened coupling is a common source of water leaks and small combustion-air/pressure leaks that can trip the pressure switch.
The OEM coupling is molded to the exact inside diameter and wall thickness needed for a leak-tight, vibration-tolerant fit. Generic rubber unions in the wrong size can slip, weep condensate, or leak the slight pressure the furnace's pressure switch monitors — causing intermittent no-heat faults.
Very Easy (1/5). Loosen the clamp(s), slide off the old coupling, seat the new one, and re-clamp. No tools beyond a nut driver or pliers. Power and gas off during service.