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The Goodman 20201901 is the OEM condensate drain hose/tube for the WGFM295115V5DAB modulating high-efficiency gas furnace. It routes acidic condensate from the coil box and drain trap to the appliance drain, and is pre-formed to the exact bend and length the furnace cabinet needs so water flows downhill with no low spots to collect debris or breed algae.
On a condensing furnace, a hose that is the wrong length or too rigid can sag and hold water, tripping the air-proving pressure switch and locking out heat. The genuine Goodman 20201901 matches the factory routing and barb sizes exactly, so it seats securely and drains reliably.
Very Easy (1/5). About 10–15 minutes: power off the furnace, slide the old hose off its fittings, press on the new hose, and confirm a snug fit and free drainage. No special tools needed. Flush the trap and inspect the other drain hoses while access is open.