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The 20201802 is a genuine OEM condensate drain hose for the Goodman WGFM195090S5DAC 95% AFUE condensing furnace. It carries acidic condensate between the collector box, drain trap, and outlet along the exact length and bend the factory designed, so the run stays leak-free and clears water without sagging or airlocks.
Bulk tubing can work in a pinch, but the OEM hose is cut to the correct length and diameter so it seats fully on every barb and routes without kinks that trap water. A kinked or oversized generic hose causes drain backups and pressure-switch faults. For a clean, reliable condensate path, use the factory part.
Power down the furnace, slide the old hose off its barbs, and press the replacement on until fully seated. Match the original routing and keep a continuous downhill slope to the trap. Prime the trap and run a heat cycle to confirm free drainage with no leaks.