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The Goodman 4053501S Chimney Collar is a genuine OEM vent fitting for the Goodman GSMS080-4 gas furnace. The collar connects the furnace flue outlet to the vent pipe, providing a secure, properly sized transition that supports correct draft and safe evacuation of combustion gases.
Vent connections must be leak-free and correctly sized. This OEM Goodman collar matches the factory flue-outlet diameter and mounting pattern for a tight, code-correct fit, avoiding the gaps and improvised adapters that generic parts often require around combustion venting.
A straightforward repair for a technician or experienced DIYer. With power and gas off, disconnect the vent pipe, remove the old collar's fasteners, seat the new collar, and reattach the venting. Confirm a secure connection and perform a draft/combustion check before returning the furnace to service.