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The Goodman 20201802 condensate drain hose tube is a genuine OEM replacement part engineered for the GMH950904CXAB high-efficiency gas furnace and compatible Goodman/Amana 90%+ AFUE models. This flexible drain tube routes acidic condensate away from the secondary heat exchanger and inducer assembly to the drain trap, keeping your furnace running clean and corrosion-free.
This is the factory OEM Goodman part, molded to the exact length and diameter the GMH950904CXAB cabinet requires so it seats without kinks or leaks. Generic aftermarket tubing is cheaper but often needs trimming, may not match the barb fittings, and can degrade faster when exposed to acidic condensate. For a furnace you rely on through the heating season, the OEM tube is the reliable choice.
A basic 20–30 minute repair for most homeowners. Power down the furnace at the disconnect, release the hose clamps or friction-fit connections, swap the old tube for the new one, and confirm a leak-free path to the drain trap. No special tools required. If you are unsure about condensate routing, consult your installation manual or a licensed HVAC technician.