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The Goodman 4053501S Chimney Collar is the genuine OEM flue/vent connector for the GMPH120-5 gas furnace. The collar joins the furnace flue outlet to the vent pipe or chimney connector, providing a secure, properly sized transition that maintains correct draft and keeps combustion byproducts contained. A rusted, warped, or missing collar can cause flue-gas leakage and unreliable venting — a safety-critical condition.
The OEM 4053501S collar is stamped to the exact flue-outlet diameter and screw pattern of the GMPH120-5, ensuring a tight, code-compliant vent connection. Generic collars may not match the outlet size, leaving gaps that compromise draft and safety. For anything on the venting path, we strongly recommend the OEM part.
Easy — usually a few sheet-metal screws to secure the collar and connect the vent pipe. Shut off power and gas, and after installation confirm proper draft and check for flue-gas leaks. If you are not comfortable working on venting, have a licensed HVAC technician complete the repair.