Morris 21795 Type S Knockout Seal with Screw and Bar, 2", 1-Pack

Type S Knockout Seals with Screw & Bar - Set screw/bar type knockout seals are inserted in open box knockouts to protect exposed wires. | Set screw/bar type knockout seals are inserted in open box knockouts to protect exposed wires | Used in standard, air tight or dust tight applications | Pre-assembled screw and backer bar slides on open knockout holes without removing box devices or covers | Steel Galvanized