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The KORA SMB20247 Square Extension Ring is designed to effortlessly enhance your electrical installations. Measuring 4”-11/16” in diameter and 2-1/8″ deep, this high-quality ring ensures a secure fit for various applications. Ideal for use with circuit breakers and electrical boxes, it helps maintain a clean and professional finish in your setup.
The SMB20247 is designed to attach to standard 4-11/16" (4" square) electrical boxes. It adds 2-1/8" of depth, increasing the box's total cubic-inch capacity to accommodate more conductors, splices, or devices. Always verify your existing box dimensions match before installation.
Yes — once the SMB20247 extension ring is installed on your 4" square box, a compatible mud ring (plaster ring) or flat cover can be fitted to the front of the extension ring to finish the installation for drywall, tile, or other wall surfaces. Ensure the mud ring or cover you select is rated for 4-11/16" square boxes.
Yes. Extension rings of this type are a standard component in Canadian electrical work and are used in compliance with the Canadian Electrical Code (CEC) to ensure adequate box fill. Verify that the combined volume of your box and the extension ring meets CEC box-fill calculation requirements for the number and size of conductors in your installation.
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