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The Goodman 10254303 Rubber Coupling is the genuine OEM flexible connector used to seal the condensate/drain and trap plumbing on the high-efficiency GCH950904CXAD 95% AFUE gas furnace. On a condensing furnace the drain system is under constant exposure to mildly acidic condensate, so a correctly rated rubber coupling is essential to prevent slow leaks that cause water damage, rust, and nuisance pressure-switch or float-safety trips.
Generic couplings may use rubber that hardens and cracks under acidic condensate, or have an inside diameter that doesn't seat cleanly on Goodman's fittings, leading to weep leaks. The genuine 10254303 is molded to the exact OD/ID and durometer Goodman specifies for a lasting, drip-free seal.
Difficulty: Very Easy (1/5). Power down, loosen the hose clamp(s), slide off the old coupling, and press the new one onto the fittings until fully seated. Re-tighten clamps evenly and run a cooling/heating cycle to confirm no drips. A quick 10-minute maintenance item.