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The Goodman M0570808 Button Plug is a genuine OEM snap-in plug used to seal unused knockout and access holes in the sheet-metal cabinet of your AMES960603BNAA gas furnace. Though inexpensive, these plugs are essential for maintaining a properly sealed combustion and blower compartment — an open hole allows conditioned-air loss, dust intrusion, and combustion-air disruption that can reduce efficiency and trip safety controls. Replacing a lost or cracked plug restores the factory air seal in seconds.
Fit is everything with a hole plug. The genuine Goodman OEM M0570808 is molded to the exact knockout diameter used on this cabinet, so its retention barbs lock in place and stay put. Off-brand plugs that are slightly undersized can pop out from panel vibration, while oversized ones won't seat at all.
Easy. Simply push the plug into the open hole until the flange snaps flush against the panel — under a minute, no tools required. Disconnect furnace power before servicing.