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The Goodman 20201901 is a genuine OEM condensate drain hose (tube) for Goodman 90%+ AFUE condensing gas furnaces including the GKS90453BXAE. This flexible tubing routes acidic condensate between the secondary heat exchanger, drain trap, and pressure switch. Because furnace condensate is mildly corrosive, the original hose eventually hardens, cracks, or collapses — causing leaks, drain blockages, and pressure-switch lockouts.
Generic vinyl tubing is often the wrong inner diameter or wall thickness, so it kinks, slips off barbed fittings, or degrades quickly against acidic condensate. This genuine OEM 20201901 is cut and formed to Goodman's exact length and bore for a leak-free, correctly routed fit with no trimming guesswork.
Easy (DIY-friendly). Shut off furnace power, pull the old hose off its barbed fittings, and press the new tube fully onto each connection. Confirm there are no kinks and that the pressure-switch line is clear. Typical replacement takes about 10–15 minutes.
Replace the drain trap (part 20171701) at the same time if it shows any cracking or fouling.