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This genuine OEM Goodman 20201802 condensate drain hose tube is a molded replacement line for the WGFM195045S3BAB high-efficiency furnace. It routes acidic combustion condensate between the collector box, inducer, drain trap, and outlet. Because it is pre-formed to the furnace's internal geometry, it maintains proper downhill flow and avoids the kinks and sags that cause water backup, pressure-switch trips, and furnace shutdowns.
The OEM 20201802 is pre-bent to the exact length and radius needed inside the WGFM195045S3BAB cabinet. Cutting a generic length of hose to fit risks kinks, incorrect slope, and loose connections that leak. The factory tube installs cleanly and seals on the original barbs.
Easy — Slip the old hose off its barbed fittings, note the routing, and press the new tube onto the same connections. A quick 5–10 minute replacement. Confirm there are no kinks and that condensate drains freely before restarting.