Southwire 4 In. x 4 In. x 1-1/2 In. Octagon Box Extension is designed to enhance your electrical wiring setup by adding extra capacity to junction boxes. This octagon extension ring allows for additional conduit runs and electrical wires without the hassle of removing existing conduit boxes and wiring from circuits. It a convenient solution for expanding wiring capacity efficiently and safely. The product is both UL and RoHS compliant, ensuring it meets high safety and environmental standards. Model Number: 55151-1/2-UPC