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This genuine OEM Goodman 20201901 drain hose routes acidic condensate away from the secondary heat exchanger and collector box of your GMH950904CXAE 96% AFUE condensing furnace. High-efficiency furnaces produce water as a byproduct of extracting heat from flue gases, and a clean, correctly-fitted drain hose is essential to prevent water backup, collector-box flooding, and pressure-switch nuisance trips. Over time, factory hoses can crack, harden, or clog with biofilm and scale — making this an important maintenance and repair part.
The Goodman 20201901 is molded to the exact length and inner diameter needed to seat securely on the collector box and drain fittings without kinking. Generic aquarium-style tubing may not match the barb sizes, leading to leaks that damage the furnace cabinet and control board. Choosing the OEM hose guarantees a leak-free, drip-tight connection.
Difficulty: Easy (1/5). Power down the furnace, slide the old hose off its barbed fittings, clear any clog from the drain path, and press the new hose fully onto each fitting. Most replacements take under 10 minutes and require no tools. Run a heat cycle and check for drips at both ends to confirm a secure fit.