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The Goodman/Amana 4053501S is a genuine OEM chimney collar (flue vent connector) for the AMS81155CNAA 80% AFUE gas furnace and compatible Goodman/Amana models. The collar seats on the furnace's induced-draft outlet and adapts it to the vent pipe, forming a clean, correctly sized transition that supports proper draft and safe flue-gas removal. A rusted, warped, or missing collar can allow leakage, poor venting, or improper connector sizing.
The OEM 4053501S matches the factory outlet diameter and screw pattern, so it aligns without gaps and maintains the listed vent connection. Universal collars often require rework or sealing to fit and may not match the flue size, risking spillage. The OEM collar keeps the venting to specification.
Shut off power, disconnect the vent pipe, remove the fasteners securing the old collar, clean the mating surface, and install the new collar with the factory screws. Re-connect and seal the vent, then verify proper draft with a combustion or draft check. Any venting work should be performed or verified by a qualified HVAC technician.