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The 20201902 is a genuine OEM 23-inch condensate drain hose tube for the Goodman/Amana AMH950905DXAA high-efficiency gas furnace. This longer run carries acidic condensate from the collector box and pressure-switch trap to the drain, and its precise length prevents the sags and low spots where water pools and causes nuisance pressure-switch faults.
The OEM 23-inch tube is pre-cut and pre-formed to the factory routing path, so it clears internal components and seats cleanly at both fittings. Cutting generic hose to length is possible but risks a poor seal or a kink that blocks flow and shuts the furnace down.
Easy (1/5). A tool-free, push-on replacement. Pull the old 23-inch hose, flush the drain path, and route the new tube along the original path. Typically done in about 10 minutes.