4" Octagon Concrete Ring Cover Blank (1) Slot, (1) Hole
Topaz 4” Octagon Concrete Rings & Covers with ½” and ¾” side knockouts are used in poured concrete construction. Rings are installed on wooden or steel concrete forms, once the forms are removed the boxes and conduit are buried in concrete and the end is open to the room wall or ceiling, ready for wire pulling. Knockouts are sealed against box surface to prevent wet concrete and water from entering the box. Manufactured of galvanized steel and available in depths from 2” to 6” with mounting tabs for quick and easy installation. Top covers are removable allowing any before-pour work.