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The Goodman 20201902 Drain Hose Tube is a genuine OEM 23-inch condensate hose engineered for the Amana/Goodman AMS951155DXAB high-efficiency gas furnace. Its factory-set 23" length is sized to reach cleanly between drain-system connection points without excess slack that could sag and trap standing water. Proper condensate removal is essential on 95%+ AFUE furnaces, where the secondary heat exchanger continuously produces liquid that must drain freely.
OEM vs. Generic: The 23" OEM 20201902 is pre-cut to the manufacturer's spec so there's no guesswork on length or fit. Cutting generic tubing to size risks leaving it too short (strained connections) or too long (sagging low spots that hold water and freeze or grow biofilm). For a few dollars, the factory-correct length keeps the drain path draining as designed.
Installation Difficulty: Very Easy (⭐☆☆☆☆). About a 10-minute homeowner swap — cut power, release the clamps or slip fittings, pull the old hose, and press the new 23" tube onto the same connection points. Ensure a steady downhill run with no low loops, then pour water through to confirm free flow before powering up.