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The Goodman M0570808 Button Plug is a genuine OEM snap-in plug used to seal unused knockout and access holes on the cabinet of the AMSS920803BNAA gas furnace and related Goodman/Amana models. Properly sealed openings prevent conditioned-air leakage, block dust and pest intrusion, and maintain the correct combustion-air pressure envelope inside the furnace casing. Missing plugs are a common cause of whistling drafts and reduced efficiency.
The OEM M0570808 is molded to the exact hole diameter and panel thickness of your furnace, so it snaps in flush and stays put. Universal generic plugs frequently sit loose or pop out under vibration, defeating the seal. The genuine part guarantees a tight, permanent fit the first time.
Very Easy (DIY-friendly). No tools needed — simply align the plug with the cabinet hole and press until it snaps into place. Replacement takes under 2 minutes. Power down the unit before opening any access panel.