Electrical Panel Breakout Adapter 3in punchout to (3) 1/2" punchouts
thingiverse
After we got solar, they replaced my main feed from the top through the bottom, leaving a 3 inch hole at the top. I have some extra circuits I'd like to add, but needed additional punchouts---well this solved both problems! It snaps in pretty tight, but if you're really wanting it never to move, just glue it into the box and you should be set.
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