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The Goodman 4053501S chimney collar is a genuine OEM flue-vent component for the Amana/Goodman AMS80703ANAA 80% gas furnace. The collar forms the transition where the furnace's draft hood meets the vent pipe, holding the flue connection square and secure so combustion gases exhaust safely. A rusted or ill-fitting collar risks flue-gas leakage — a safety-critical repair.
The OEM collar is stamped to Goodman's exact diameter and flange pattern so it seats flush with no gaps. A generic collar may fit dimensionally but can need extra sealing or fastener holes. Because this part handles combustion venting, OEM is strongly recommended.
Easy (2/5) — a few sheet-metal screws. Shut off power and gas, detach the old collar, position the new one, fasten, and verify the vent draws properly. Confirm no flue-gas spillage after startup. About 20 minutes.