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The Goodman 20201902 23-inch Drain Hose Tube is the genuine OEM condensate drain line used on GKS91155DXAC gas furnaces. When your high-efficiency furnace runs, it produces condensate that must be routed cleanly away from the heat exchanger and inducer assembly. A cracked, brittle, or clogged drain tube leads to water pooling, nuisance pressure-switch lockouts, and potential water damage around the unit — this direct-replacement hose restores proper drainage and keeps your system running through the heating season.
The genuine Goodman part is cut and molded to the exact bend radius and inside diameter your furnace's drain ports require, so it seals without kinking or over-stretching. Universal generic hose can work in a pinch but often needs trimming, adapters, or extra clamps and can collapse under vacuum — leading to the very drainage faults you're trying to fix. For a guaranteed, drop-in fit we recommend the OEM tube.
Easy (1 of 5). Power down the furnace, slide the old hose off the drain fittings, route the new tube along the same path, and secure with the existing clamps. Most homeowners complete this in under 15 minutes with basic hand tools. Confirm there are no low spots that could trap water.