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The Goodman 20201802 Drain Hose Tube is a genuine OEM condensate line for the GCH91155DXAE high-efficiency gas furnace and compatible Goodman/Amana models. High-efficiency (90%+ AFUE) furnaces produce acidic condensate during combustion, and this molded drain tube routes that moisture safely from the secondary heat exchanger and collector box to the condensate trap and drain.
OEM vs. Generic: The genuine 20201802 tube is molded to the correct length and bend radius for this cabinet, so it seats without kinks that can trap water and cause condensate backups or pressure-switch faults. Cut-to-length generic hose can work but rarely matches the factory routing and clearances.
Install difficulty: Easy (1/5). Replacement usually takes under 10 minutes: power off the furnace, slide the old hose off its barbed fittings (release any clamps), and press the new tube fully onto both fittings. Verify a clear, downhill path so condensate drains freely and check for leaks after restart.