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The Goodman 20201802 Drain Hose Tube is a genuine OEM condensate drain component engineered specifically for the GCH950904CXAE gas furnace and compatible Goodman/Amana high-efficiency models. This flexible drain tube routes condensate away from the heat exchanger and inducer assembly, preventing water pooling, corrosion, and nuisance lockouts on 90%+ AFUE condensing furnaces.
Because it is a factory-original part, the 20201802 matches the exact length, diameter, and barb geometry of the tube that shipped with your furnace, so there is no trimming, adapting, or guesswork during installation.
Generic aftermarket tubing is often the wrong bore size or too rigid, which leads to kinked runs and slow drainage. This genuine OEM Goodman tube seats correctly on factory barbs the first time and preserves your equipment warranty. If budget is the priority, a generic universal drain line can work, but you sacrifice exact fit and long-term reliability.
Difficulty: Easy (DIY-friendly). Power down the furnace, slide the old tube off the fitting, seat the replacement, and confirm a clear downhill drain path. Most homeowners complete this in under 10 minutes with no special tools.