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The Goodman 20201902 is a factory-original 23-inch condensate drain hose tube built for the GKS90904CXAE condensing gas furnace and related Goodman/Amana platforms. The pre-cut 23" length matches the factory routing between the collector box/trap and the cabinet outlet, so condensate flows freely without excess slack or tight bends that cause standing water.
A generic length cut on-site risks the wrong ID or sloppy routing. The genuine 20201902 arrives at the exact factory-specified 23" length and diameter, ensuring proper slope to drain and a secure fit on Goodman drain barbs.
Easy (1/5). A 10–15 minute swap. Shut off power, slide the old tube off its fittings, install the new 23" tube maintaining a downward slope, and verify unobstructed drainage.