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The Goodman 10254303 Rubber Coupling is a genuine OEM flexible seal used on the GMH950905DXAA 95% AFUE condensing gas furnace. Rubber couplings connect and seal internal tubing junctions — such as inducer, pressure-switch, or condensate-drain connections — creating an airtight, leak-free joint that keeps the furnace's pressure-sensing and condensate-management systems working correctly. A cracked, hardened, or split coupling can cause pressure-switch faults, water leaks, or nuisance lockouts.
Genuine OEM couplings are molded to the exact inside diameter and durometer needed for a secure fit on your furnace's fittings. Generic rubber connectors may be too loose or too stiff, leading to slow leaks and repeat service calls. At this price point, the OEM part is the clear choice.
Slide the old coupling off, push the new one fully onto both fittings, and secure with the original clamps if equipped. No special tools required. Shut off power before opening the furnace cabinet.