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The Goodman 20171701 Condensate Drain Trap is a genuine OEM replacement for the GKS90904CXAB high-efficiency gas furnace and compatible Goodman/Amana 90%+ AFUE models. In a condensing furnace, the secondary heat exchanger produces acidic condensate that must drain away freely while maintaining the correct pressure seal. This factory drain trap keeps flue gases from escaping the drain path while allowing water to exit. A cracked, clogged, or aftermarket trap can trigger pressure-switch faults, water leaks, and lockouts.
OEM vs. Generic: The trap's internal geometry and port sizing are engineered to match your furnace's pressure switch and drain routing. Generic traps often don't seal correctly, leading to intermittent pressure-switch trips that are notoriously hard to diagnose. This genuine Goodman trap drops in with the correct fit and eliminates guesswork.
Install difficulty: Moderate — disconnect and drain the existing tubing, remove the old trap, and reconnect hoses without kinks. Prime the trap with water before restarting so the pressure switch reads correctly. A shop vac helps clear any sludge from the drain lines during service.