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The Goodman 10254303 is an OEM rubber coupling/seal used in the AMV91155DXBA high-efficiency furnace to create an airtight, watertight connection between drain or vent components. In a condensing furnace, even a small leak at a coupling can drip acidic condensate onto the control board or allow a draft leak that trips the pressure switch. This flexible molded coupling absorbs vibration and maintains a positive seal across thermal cycling.
The genuine 10254303 is sized to the exact inside/outside diameters of the mating parts so it seats fully and seals under clamp pressure. Generic rubber couplings that are slightly off-size will weep condensate or leak draft, leading to intermittent faults that are frustrating to diagnose. At this price, the OEM seal is inexpensive insurance.
Easy (1/5). Slip the coupling over the fittings and secure the clamp(s). Under 10 minutes for most homeowners. Confirm the clamp is snug and check for leaks after restart. Shut off power and gas first.