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The Goodman M0570808 button plug is a genuine OEM part that seals an unused knockout or access hole in the VCES960603BNAA gas furnace cabinet. These snap-in plugs close off factory openings left after wiring, tubing, or accessory changes, preventing air infiltration that can disturb cabinet pressure, condensate routing, and pressure-switch operation. Restoring the factory seal keeps the furnace running cleanly and quietly.
OEM vs. Generic: The genuine Goodman plug matches the exact knockout diameter for a secure, airtight snap fit that won't pop loose or whistle. Universal hole-plug assortments often fit loose or won't seat fully, defeating the air seal. For a couple of dollars, the OEM part removes the guesswork.
Install difficulty: Very easy (1 of 5). Push the plug into the open knockout by hand until it snaps flush — no tools required. Replacement takes under a minute.