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The Goodman 20201902 is a genuine OEM 23-inch condensate drain hose (tube) for the WGFM195070S4CAB 95% AFUE, 70,000 BTU gas furnace. This longer run carries acidic condensate across the cabinet from the collector box to the drain trap and external drain. Because condensing-furnace condensate is mildly acidic, hoses stiffen and crack with age — a failed hose leads to water on the floor, cabinet rust, and nuisance pressure-switch trips. The correct-length OEM replacement keeps the drain path sealed end to end.
This OEM hose arrives pre-cut to the exact 23-inch length with the correct inner diameter, so it reaches its fittings without stretching, sagging, or splicing. Generic bulk tubing can work but must be measured, cut, and ID-matched precisely; get it wrong and you invite kinks or leaks. For a clean, right-first-time drain repair, OEM is recommended.
Power off the furnace, remove the old 23" hose from both barb fittings, and press the replacement fully onto each end following the factory route. A 5–10 minute job with little more than a nut driver. Run the furnace and confirm smooth condensate flow to the trap with no leaks.