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The Goodman 20201901 Drain Hose Tube is a genuine OEM condensate line engineered for the GCH91155DXAE high-efficiency gas furnace and compatible Goodman/Amana models. In a 90%+ AFUE furnace, combustion produces acidic condensate that must be drained reliably; this pre-formed tube carries that moisture from the collector box and secondary heat exchanger to the condensate trap and drain assembly.
OEM vs. Generic: The genuine 20201901 tube is molded to the exact length and bend profile for this cabinet, avoiding the kinks and standing water that lead to condensate backups, drain-related lockouts, or water damage. Generic bulk hose can substitute in a pinch but seldom matches the factory routing and connection points.
Install difficulty: Easy (1/5). Replacement takes about 10 minutes: shut off power to the furnace, remove any retaining clamps, slip the old hose off its barbed fittings, and press the new tube fully onto both ends. Confirm a continuous downhill slope for free drainage and inspect for leaks after the furnace restarts.