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The Goodman 20171701 Condensate Drain Trap is a genuine OEM assembly for the GKS91155DXAC and other 90%+ high-efficiency Goodman and Amana gas furnaces. In a condensing furnace, the secondary heat exchanger produces acidic condensate that must drain freely while maintaining a water seal so combustion gases and inducer pressure stay contained. This trap provides that seal. A cracked, clogged, or brittle old trap causes water leaks, pressure-switch faults, and ignition lockouts.
The OEM trap matches the exact port spacing, barb sizes, and internal geometry of your furnace's drain system — critical for keeping the correct water column and pressure seal. Generic traps rarely align with the factory hose routing and can starve the pressure switch or leak at mismatched connections. OEM protects both operation and warranty.
Rated Moderate, about 30–45 minutes. Power down the furnace, disconnect the condensate hoses (label them first), release the mounting clips or screws, and transfer the connections to the new trap in the same layout. Prime the trap with water before restarting and verify free drainage plus a clean pressure-switch closure. Best performed by a qualified HVAC technician.