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The genuine Goodman 10254303 rubber coupling is an OEM sealing component for the GCH950904CXAC high-efficiency gas furnace and related Goodman/Amana condensing models. This flexible coupling joins drain, trap, or induced-draft components and forms a leak-tight seal that keeps condensate and flue gases contained — a small part whose failure can cause water leaks, pressure-switch faults, or lockout codes.
Because rubber couplings are sized to an exact inside diameter and durometer, an OEM Goodman part guarantees a proper, lasting seal. Generic couplings that are close-but-not-exact tend to weep, slip, or harden prematurely in a condensing furnace's warm, damp environment. The OEM part is the reliable choice for this seal.
Difficulty: Easy (DIY-friendly). Power down the furnace, loosen any clamps, slide off the old coupling, and press the new one into place — re-secure clamps if used. A 10–15 minute job requiring no special tools. Verify the drain flows freely and check for leaks after restarting.