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The Goodman 20201901 Condensate Drain Hose Tube is a genuine OEM part cut and formed to fit the GKS90905DXAF high-efficiency furnace. This flexible tube routes acidic combustion condensate from the collector box and drain trap to the field drain. Because the factory hose is pre-shaped to clear the cabinet and inducer, an OEM replacement avoids the kinks and hard bends that cause backups and nuisance pressure-switch lockouts.
The OEM hose arrives at the correct length and inner diameter to slip over the factory barbs and clamps with no trimming or guesswork — the fastest, leak-free option. A generic length of tubing can work in a pinch but must be measured, cut, and routed by hand, and the wrong ID may pop off under condensate pressure.
Easy (1/5). Turn off the furnace, slide back the retaining clamps, pull the old hose from its fittings, and press the new hose fully onto each barb before re-securing the clamps. A 10–15 minute swap. Confirm there are no low spots that trap water, and run the furnace briefly to verify condensate flows freely to the drain.