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The Goodman 20201802 is a flexible condensate drain hose tube for GKS90703BXAA high-efficiency gas furnaces. It routes acidic condensate from the drain trap, collector box, and pressure switch to the drain, resisting the heat and chemistry of flue condensate. Over time these hoses harden, crack, or clog with debris and biofilm — leading to leaks, pressure-switch trips, and no-heat lockouts. A fresh OEM hose restores reliable drainage.
The genuine Goodman hose is cut to the correct length and inside diameter to seal on this furnace's barbed fittings without kinking. Generic tubing may be the wrong bore or a lower temperature rating, inviting leaks and premature failure. The OEM part guarantees a proper, lasting fit.
Easy — slide the old hose off the fittings, route the new hose the same way, and confirm no kinks or low spots that trap water. A straightforward DIY replacement; verify drainage on restart.