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The genuine Goodman 20201901 is a molded condensate drain hose tube engineered for the GMH951155DXAB 96% AFUE two-stage furnace. High-efficiency condensing furnaces continuously drain acidic condensate from the secondary heat exchanger, and this longer, contoured hose carries that water from the collector box to the drain trap. Over years of service the factory hose can harden, crack at the bends, or slip off its fittings — leading to water pooling, blocked-drain pressure faults, and premature corrosion. Replacing it with the correct OEM tube restores dependable operation.
Because 20201901 is a shaped, application-specific hose, the OEM Goodman part drops in with the exact length and pre-formed bends the cabinet layout requires. A generic straight hose can be substituted at lower cost but must be hand-routed and may kink at tight corners, restricting flow. For guaranteed fit and full flow, the OEM tube is the right choice.
Easy (1/5). Roughly 10–15 minutes with a nut driver or pliers. Cut power, photograph the routing, remove the old hose from the barbed connections, and seat the replacement. No specialized tools or HVAC certification needed.