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The Goodman 20201901 is a factory-original condensate drain hose/tube engineered for the WFD195090S4CAA high-efficiency gas furnace. This molded hose carries acidic combustion condensate along the furnace's internal drainage circuit — connecting the collector box, inducer, and drain trap — while its pre-formed shape maintains the slope needed for reliable, gravity-fed drainage. Brittle, split, or blocked hoses are a frequent cause of water leaks and pressure-switch lockouts on condensing furnaces.
The OEM 20201901 is shaped to the precise bend radius, length, and fitting diameter your furnace requires. Substituting generic tubing risks kinks, sags, and standing water that trigger nuisance faults. The genuine molded hose restores the exact factory routing for trouble-free drainage.
Easy — remove the old hose from its barb connections and seat the replacement, checking for kinks and a secure fit at both ends. A straightforward repair; shut off power beforehand and confirm leak-free operation on restart.