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The genuine Goodman/Amana 10254303 rubber coupling is a flexible sealing connector used in the condensate and induced-draft venting system of the AMV90453BXBB 90% AFUE furnace. It joins pipe sections with a watertight, vibration-dampening seal that prevents flue-gas and condensate leaks. Over time, the original rubber can harden and crack — replacing it with the OEM part restores a reliable seal.
OEM couplings are molded to the exact inside diameter of this furnace's venting, ensuring a snug, leak-proof fit. Generic hardware-store couplings may not seat correctly and can allow condensate seepage or draft loss. The low OEM price makes exact-fit the obvious choice.
Easy. Slip-on replacement, typically secured with a hose clamp. Shut down the furnace, remove the old coupling, and seat the new one fully before re-clamping. A common preventive-maintenance item.