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The Goodman 20201901 is a genuine OEM condensate drain hose designed for the GKS90703BXAG high-efficiency furnace. It routes acidic condensate from the drain trap and collector box to the home drain line. Because condensing-furnace runoff is mildly acidic, the correct OEM hose material resists corrosion and hardening far better than generic vinyl tubing — a hardened or cracked hose leads to leaks, water damage, and pressure-switch faults.
The OEM hose is cut and shaped to the exact routing of the GKS90 cabinet with the correct inner diameter for a leak-free press fit on the trap and collector barbs. Generic tubing often mismatches the barb size, requiring clamps that still seep. Choose OEM for a clean, sealed connection.
Easy — Roughly 10–15 minutes. Power off the furnace, pull the old hose from the barb fittings, slide the replacement on, and secure. No tools required beyond a utility knife if trimming is needed.