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The Goodman M0570808 Button Plug is the factory snap-in plug used to seal unused knockouts, access holes, and conversion openings on the ACES960603BNAA gas furnace cabinet and gas-valve/manifold assembly. Keeping these openings plugged preserves the sealed combustion design, blocks air infiltration, and keeps debris and pests out of the burner compartment.
If your furnace cabinet has an open hole after a service, a venting change, or a missing original plug, this OEM part snaps in for an instant flush, finished seal that matches factory specs.
Off-the-shelf plugs often size loosely and pop out under cabinet vibration. The OEM M0570808 is dimensioned to the exact Goodman knockout for a tight, retained fit that will not back out during normal operation, so you seal it once and forget it.
Easy (1/5) — Hand-press into the open hole; no tools required, about 2 minutes. De-energize the furnace before opening any panel.