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The Goodman 20201901 is a factory-specified drain hose tube for the condensate system of AMVC950905CXAD 96% AFUE variable-speed furnaces. This is a longer/heavier-gauge run in the drain assembly than the companion 20201802 tube, carrying condensate between the collector box, trap, and drain outlet. Over years of exposure to warm acidic condensate, factory tubing can harden and split — this OEM replacement returns the assembly to spec and eliminates leaks that trigger pressure-switch faults and water damage.
Genuine 20201901 tubing arrives pre-cut to the correct length with the right inner diameter to seal on the OEM barb fittings, so there's no guesswork on routing. Universal hose is cheaper by the foot but requires cutting, may not match the barb size, and rarely uses the same acid-resistant compound — a common cause of repeat leaks. For a reliable, one-and-done repair, the OEM tube is worth the small premium.
Difficulty: Easy (DIY-friendly). Shut off furnace power, remove the clamps, pull the old tube from its fittings, and press the new one into place. Confirm a continuous downhill slope to the trap, re-secure the clamps, and run the furnace briefly to check for leaks. Typical time is 15–20 minutes with basic hand tools.