1/2 Conduit Electrical Box Knockout Plug Cap NEMA EMT
thingiverse
Here's a quick print for you if your electrical box or panel is missing a knockout. You can use this to fill in the empty spots and keep stuff out of your junction box or panel. This design was created in Fusion360 using the NEMA Conduit Fitting specification, so it should fit most typical electrical boxes with 1/2 conduit knockouts. I will also be posting a version for 3/4 conduit knockouts.
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