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The M0570808 is a genuine Goodman snap-in button plug used throughout the ACVM970603BNAA gas furnace cabinet. These plugs fill unused knockouts and access holes in the sheet-metal panels, blocking air leaks, dust, and small pests while keeping the furnace's sealed combustion and airflow envelope intact. A missing plug lets conditioned air bypass the heat exchanger and can affect blower static pressure.
The genuine Goodman plug is sized to the exact knockout diameter so it seats flush and stays put. Generic rubber grommets often sit loose or fall out with thermal cycling. For a clean, permanent seal, the OEM M0570808 is the right choice.
Very easy (1/5). Press the plug into the open hole until it snaps flush — no tools, under a minute. Power down the furnace before reaching into the cabinet.