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The 20171701 is the genuine OEM condensate drain trap for the Goodman GCV90905DXBB 90%+ AFUE condensing gas furnace. The trap collects acidic condensate from the secondary heat exchanger and inducer, maintains a water seal so flue gases can't escape through the drain, and routes moisture to the drain line. A cracked or clogged trap causes water leaks, pressure-switch faults, and furnace lockouts.
The OEM trap matches Goodman's exact port layout, hose barb sizes, and internal water-seal geometry — critical for correct pressure-switch operation. Generic traps rarely align with all connection points and can cause chronic drainage or nuisance-lockout problems. For a condensing furnace, OEM is the reliable fix.
Moderate (2/5). Power down the furnace, disconnect and label each condensate hose, remove the old trap, install and prime the new trap with water, then reconnect all lines and check for leaks. About 20–30 minutes.