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The Goodman 20201902 is a genuine OEM 23-inch condensate drain hose tube engineered for the WGFD295070V4CAA high-efficiency gas furnace and compatible Goodman/Amana models. During normal operation a condensing furnace produces water vapor that must be routed safely to the drain; this flexible tube carries that condensate away from the secondary heat exchanger and collector box, preventing pooling, corrosion, and nuisance lockouts.
Aftermarket hoses often use thinner walls or the wrong bend radius, which can kink and cause condensate backups that trip the pressure switch. This genuine OEM part matches Goodman's exact length, diameter, and routing so it seats correctly the first time and holds up to years of acidic condensate exposure.
A basic DIY replacement — typically 10 to 15 minutes with no special tools. Power down the furnace, slide the old hose off the fittings, route the new tube along the same path, and secure the clamps. Confirm a continuous downward slope to the drain before restarting. If you are unsure about condensate routing, consult a licensed HVAC technician.