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The Goodman 20201901 is a genuine OEM condensate drain hose/tube for the GKS90904CXAD 90%+ AFUE furnace and compatible Goodman/Amana models. It carries acidic condensate between the collector box, drain trap, and drainage outlet inside the furnace cabinet. A cracked, brittle, or clogged drain tube is a frequent cause of water pooling in the burner compartment and repeated high-efficiency furnace lockouts on the pressure switch.
The OEM 20201901 matches the exact length, bends, and bore Goodman specified for the GKS90904CXAD, ensuring proper slope and free drainage. Generic hose kits often require trimming and may not seat cleanly on the molded ports. OEM guarantees a leak-free, correctly routed drain line.
Rated 2/5. Shut off furnace power, note the routing of the original hose, disconnect it from its fittings, and install the replacement along the same path. Roughly 10 minutes with no special tools.
Match the original routing so the tube maintains a downward drain slope.