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aPbox Installation and Operations Manual
15
Remove the knockouts
Step 1
Place a 1/4”X4” straight screwdriver against the black spot printed on the knockout
hole, and then knock it with a hammer. Hammer until the knockout plug is angled
out.
Step 2
Using a needle-nose plier, twist the plug back and forth until the attachment points
snap.
Step 3
Dislodge the rest of the knockout. If burrs remain, remove them with a deburring
tool.