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The Goodman 20201901 is the genuine OEM condensate drain hose/tube for the GKS90453BXAA 90%+ AFUE gas furnace and compatible GKS9-series models. This molded tube carries acidic condensate from the collector box and secondary heat exchanger toward the drain trap. Because the condensate is mildly corrosive and runs continuously during heating cycles, drain hoses eventually stiffen, sludge up, or split — showing up as puddles under the furnace, a wet trap, or repeated pressure-switch lockouts. Swapping the hose restores clean, reliable drainage.
The 20201901 is pre-formed to the exact routing and barb sizes of the GKS90453BXAA cabinet. Universal tubing often sits at the wrong angle or slips off oversized fittings; the OEM hose seats securely and holds the drainage slope Goodman designed, preventing standing water and trapped air.
Rated Easy (1 of 5). Cut power, note the routing, pull the old hose off its barbs, and press the new one fully onto each fitting with no kinks. Roughly 10–20 minutes with basic tools. Flush with water to confirm free flow before restoring power.