Southwire 2-1/8 In. x 4 In. x 1-7/8 In. Outlet Box Extension is a handy utility extension ring designed to be added to 4 In. x 2 In. handy boxes to increase wiring capacity. This extension provides easy access for additional conduit runs and electrical wire, making it i for expanding existing electrical setups without the need to remove old conduit boxes and wiring from circuits. With a generous 21 cubic inch capacity, it ensures ample space for your wiring needs while maintaining a secure and organized installation. Model Number: G19281-E-UPC