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The Goodman 4053501S Chimney Collar is a genuine OEM flue-vent fitting for the GMV80703BXA 80% AFUE gas furnace. It seats the vent connector to the induced-draft blower outlet, ensuring a tight, code-compliant transition to the flue pipe so combustion gases exit the home safely.
The OEM Goodman collar is stamped to the furnace's exact vent-outlet dimensions, so the flue pipe lands flush and the gasket seals on the first try. Generic collars often require shimming or extra sealant to close gaps, which risks flue-gas leakage. Because this part is on the combustion-venting path, precise OEM fit matters for safety.
Easy to Moderate (2/5). Disconnect the vent pipe, remove the old collar's fasteners, seat the new collar with the supplied gasket, and re-secure. Verify a proper draft after startup. Typically 20–30 minutes for a comfortable DIYer; call a pro if you're unsure about venting.