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The Goodman M0570808 is a genuine OEM button plug used on the AMEC960302BNAC gas furnace and compatible Goodman/Amana equipment. This snap-in plug fills unused knockout holes in the sheet-metal cabinet — such as alternate gas-line, electrical, or venting entries — sealing the opening to block air leaks, dust, and pests and to keep conditioned airflow inside the cabinet.
The OEM M0570808 is sized to Goodman's exact knockout diameter, so the retention flange locks in and stays put. Generic assortment plugs are often slightly off-size and pop loose over time. OEM guarantees a flush, secure seal.
Rating: Very Easy (1/5). Push the plug into the knockout hole until the flange snaps flush — no tools required. Less than a minute.