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Three Piece Knockout Seals are used to cover exposed knock-out holes in metal enclosures or outlet boxes. They are held in place by a screw inserted through the seal into a threaded strap on the opposite side of the opening. They are able to installed from the inside or outside of any box without rearranging wires. This Product is Made up of Carbon Steel.<br><br>

L.H.Dottie&#174; 3 Piece Knockout Seal, Carbon Steel, 4&quot;, 10 Pack

3-piece-knockout-seal-carbon-steel-4-size-pack-of-100

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