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The Goodman M0570808 button plug is a genuine OEM snap-in closure for the Amana/Goodman AMES960805CUAB gas furnace. It fills unused knockout or access holes in the furnace cabinet and blower panels, blocking air bypass and keeping the cabinet sealed to the airflow path the unit was engineered for. Missing plugs cause pressure leaks that reduce efficiency and can trip pressure-switch faults.
The OEM plug is sized to the exact knockout diameter so it snaps flush and stays put under blower pressure. Generic plugs that run slightly under-size can pop loose or whistle, and the cost savings are negligible. For a leak-free cabinet, use the factory M0570808.
Easy. Simply press the plug into the open knockout until the flange snaps home. No tools needed and completed in under a minute; power down the furnace as a standard precaution before opening panels.