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Genuine OEM Goodman 20201901 condensate drain hose tube, engineered as a direct factory replacement for the GCV90905DXBB 96% AFUE gas furnace. This is the primary condensate routing tube in the furnace's drain system, moving corrosive condensate from the secondary heat exchanger and inducer assembly to the drain trap. Because it is a pre-formed OEM component, it holds its shape under the furnace's negative-pressure draft and resists the acidic condensate that degrades lesser tubing over time.
The 20201901 is shaped to Goodman's exact fitting geometry, so every barb and bend lines up with the cabinet layout — no leaks, no kinks, no improvised clamps. Generic bulk hose is cheaper but frequently seals poorly and can collapse, causing pressure-switch faults and condensate spilling into the burner compartment. On a high-efficiency furnace, OEM is the reliable choice.
Rated Easy — a clamp-and-slip replacement completed with a nut driver in most cases. Cut power and gas before servicing, and confirm the condensate trap and drain line are clear while you have the panel off. When in doubt, use a licensed HVAC technician.