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The Goodman 10254303 is a genuine OEM rubber coupling / seal used in the condensate and drain plumbing of the GMH950704CXAB high-efficiency gas furnace. It joins drain-system components with a flexible, leak-tight connection that absorbs vibration and tolerates the mildly acidic condensate produced by 95%+ AFUE combustion. A hardened, cracked, or perished coupling is a frequent source of slow drips, water on the furnace floor, and pressure-switch faults.
The OEM 10254303 is molded to the precise inner diameter and durometer Goodman specifies for a proper seal on this furnace. Generic rubber couplings may be a loose or over-tight fit, leading to leaks or split flanges. The genuine part ensures a reliable, vibration-damping connection the first time.
This is a quick 10–15 minute repair. Power down the furnace, relieve any water in the drain line, slide off the old coupling, and press the new one fully onto the connections — securing hose clamps if originally fitted. Verify your furnace model number before ordering. No special tools required for most installations.