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The Goodman 20171701 Condensate Drain Trap is a genuine OEM drainage component for the Goodman GKS90905DXAD 90%+ AFUE condensing gas furnace. High-efficiency furnaces extract latent heat from flue gases, producing acidic condensate that must drain away safely. This trap maintains a water seal that blocks flue gases from escaping through the drain line while allowing condensate to flow out. A cracked, clogged, or missing trap leads to water leaks, pressure-switch faults, and lockout no-heat codes.
The trap's port spacing, inlet/outlet geometry, and seal height are model-specific. The OEM 20171701 matches Goodman's exact configuration so it mates to the collector box and drain hoses without adapters or leaks. Generic traps often require rework and can compromise the pressure-switch signal. For reliable condensate management, OEM is recommended.
Moderate — power down, detach the drain hoses and collector connections, prime the new trap with water, and reconnect. Check for leaks and confirm proper drainage on first firing.