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The Goodman 20201901 Drain Hose Tube is a genuine OEM condensate component built for the WGFM195090S5DAB high-efficiency gas furnace. This larger molded drain assembly connects the collector box or condensate trap to the furnace's drainage system, carrying corrosive condensate safely away from the heat exchanger. Its factory-specific shape maintains the correct downhill slope and clearances inside the Goodman cabinet.
OEM vs. Generic: Because this hose spans a longer, contoured run inside the furnace, the pre-molded OEM 20201901 is critical — generic tubing tends to sag or kink over that distance, pooling condensate and tripping the pressure switch. The genuine part guarantees correct fit and reliable, self-draining flow.
Install Difficulty: Easy. Turn off power, detach the old hose from its barbed connections and any clips, then seat the replacement on the matching ports — typically 10–15 minutes. Verify the routing drains fully toward the trap and flush with water to confirm no blockage before restarting. Recommended as part of routine condensate-system maintenance.