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The Goodman M0570808 is a genuine OEM snap-in button plug designed to seal unused knockout and access holes in the sheet-metal cabinet of your AMSS960804CNAA gas furnace. Though small, this plug keeps conditioned air, combustion air, and pests where they belong — a missing plug can disrupt airflow across the heat exchanger and cause nuisance limit trips. This is the exact factory part specified by Goodman and Amana, so it drops into the pre-formed opening without modification.
The genuine Goodman plug is molded to the precise diameter and locking-tab geometry of the factory knockout, giving a flush, rattle-free seal. Universal aftermarket plugs are often loose or oversized, working free with furnace vibration. For a couple of dollars, the OEM part is the sensible choice.
Very Easy (1/5) — no tools required. Line up the plug with the open hole and press firmly until the tabs snap flush. Always cut power at the disconnect before opening any furnace panel.