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The Goodman 20201901 is a genuine OEM condensate drain hose tube built for the WFD195090S4CAB high-efficiency gas furnace and related Goodman/Amana models. In a condensing furnace, combustion byproducts create acidic water that must be drained continuously and reliably. This molded tube delivers the exact bend radius and length the factory specified, keeping condensate flowing from the collector box and inducer to the trap without pooling that can trip the pressure switch or corrode nearby components.
Generic replacement hose is typically straight, unbent stock that installers must force into position, creating stress points and low spots where water collects. The genuine Goodman 20201901 arrives pre-formed to the furnace's internal geometry, so it seats naturally, drains fully, and eliminates the airlocks that cause intermittent no-heat calls.
Easy (1/5). This is a slip-fit part secured by the original clamps. Shut off power, remove the old hose, press the new tube onto both fittings, re-clamp, and verify a clear path to the drain. Typical replacement time is 10–15 minutes with basic hand tools.