Switch/Outlet Box, 4-Gang, Depth: 3.56", Old Work, Non-Metallic4 Gang, Old Work, Switch Outlet Box, Non Metallic, Depth: 3. 56". Cubic Inches: 68". Includes: Ears, Clamps Carlon SuperBlue Boxes combine the features of the hard shell thermoset box and the thermoplastic PVC style box to create a new rigid non metallic wiring box. Molded out of specially formulated thermoplastic material, Carlon SuperBlue boxes are so strong they won't crack or break in extreme environments. So rigid, they resist flexing and hold