1 Knockout Seal 3 4
4" Knockout Seal for Electrical Junction Box or Panel KOS-400 Enjoy the Halex 3/4 in. Knock-Out Seals (4-Pack) 26072, metal suitable for indoor and outdoor use, the seals are made with zinc-plated steel for strength at - These snap in style knockout seals are inserted in discontinued open box knockouts to protect 3 in. Oil-tight Knockout Seal with Gasket 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 1/2" Snap In Style Knockout Seal: SNAP50 ...