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The Goodman 10254303 is a genuine OEM rubber coupling used on the GMV91155DXBA high-efficiency condensing gas furnace. This flexible seal joins condensate drain and vent components, providing a watertight, vibration-tolerant connection between the collector box, drain trap, and associated tubing. Because condensing furnaces produce continuous acidic condensate, a hardened or split coupling is a frequent source of drip leaks and pressure-switch faults.
Generic rubber couplings often have slightly different inside diameters and rubber compounds that harden or degrade faster against acidic condensate. The genuine OEM 10254303 is sized to Goodman's exact tubing and rated for long-term condensate exposure, preventing slow leaks that damage furnace internals.
A quick, homeowner-friendly repair. Power off the furnace, slip off the old coupling, clean the tubing ends, and press the new coupling into place. Run the furnace through a heat cycle and confirm there are no condensate leaks at the connection.