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The Goodman 20201901 is a molded OEM condensate drain hose tube for the WFD195045S3BAB high-efficiency gas furnace and compatible Goodman/Amana models. On a condensing furnace, a network of pre-formed hoses carries acidic condensate from the secondary heat exchanger and collector box through the drain trap to the outlet. This factory-molded hose is shaped for a specific run in the cabinet, seating on its barbed fittings without kinks so condensate drains freely and the pressure switch reads correctly. A brittle, cracked, or clogged hose leads to leaks and intermittent no-heat lockouts, and should be replaced with the genuine part.
The OEM 20201901 is molded to the exact length, bend, and diameter for its position in this furnace. Substituting generic tubing risks kinks, loose fits, and false pressure-switch signals that cause hard-to-diagnose lockouts. For reliable condensate drainage, the OEM molded hose is recommended.
Easy — DIY-friendly. Shut off the furnace, photograph the existing routing, remove the old hose from its barbs, and press the new hose into place. Re-secure any clamps and confirm free drainage with no kinks or leaks before returning the furnace to service.