1 1/2 Weatherproof Knockout Seal
Pro Tip: Running Conduit #shorts 3" Knockout Seal for Electrical Junction Box or Panel KOS-300-VT CANTEX PVC Weatherproof Exposed Electrical Box Installation How To Fill Missing Knock Outs In Electrical Boxes 2-1/2 in steel, screw/bar type knockout seals are inserted in discontinued, open box knockouts to protect exposed wires. They are - 1-1/2" gasketed steel, screw/bar type knockout seals are inserted in discontinued, open box ...