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The Goodman M0570808 is a genuine OEM button plug used on the AMSS921005CNAB gas furnace to seal unused knockouts, wiring access holes, and mounting openings in the sheet-metal cabinet. Sealing these openings maintains the furnace's air-flow envelope, keeps out dust and pests, and preserves the clean, finished appearance of the installation.
The OEM button plug matches the exact knockout diameter on this furnace for a secure snap-in fit that won't rattle or pop out. Generic plugs are often the wrong size and leave gaps. For a proper seal, choose the factory OEM plug.
Very Easy (1/5) — No tools needed. Align the plug with the open hole and press until it snaps flush against the cabinet.