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The Goodman 0128F00006 is a genuine chimney transition bottom — the sheet-metal flue-vent fitting that channels combustion gases from the heat exchanger collector box up into the furnace's vent connector on VMS81005CNAA gas furnaces and compatible Goodman/Amana models. A rusted, corroded, or misfitting transition can leak flue gases and disrupt draft, so a clean, factory-shaped replacement is important for safe venting.
This transition is stamped to match the exact bolt pattern and gasket seat of your furnace's collector box. The OEM 0128F00006 seals correctly the first time. Generic or fabricated substitutes rarely match the flange geometry, risking flue-gas leakage and improper draft — an unacceptable risk on a venting component. Fit OEM here.
Moderate (3/5). Shut off power and gas, disconnect the vent connector, remove the collector-box fasteners, and swap the transition with a fresh gasket/sealant as required. About 30–45 minutes and access can be tight. A combustion/draft check after reassembly is strongly advised. Professional installation recommended for any flue-vent work.