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The Goodman M0570808 Button Plug is the genuine OEM snap-in plug used to seal unused knockouts and access holes in the sheet-metal cabinet of the ACSS920603BNAA furnace. Sealing these openings keeps conditioned air, dust, and small debris out of the cabinet and maintains the intended airflow and combustion-air balance. A missing plug can create a parasitic air leak that affects efficiency and pressure-switch performance.
The OEM button plug matches the exact knockout diameter on the Goodman cabinet, so it seats flush and locks in with its retention barbs. Generic plugs in the wrong size fall out or leave gaps. For a clean, airtight seal, the genuine plug is the right part.
Very Easy (1/5). Push the plug into the open knockout until the barbs snap home. No tools needed, under a minute.