Enerlites 975501-C 4” floor box cover can be installed in hardwood, tile, carpet, marble and granite flooring or countertops. Requires a junction box for mounting (sold separately). When combined with Enerlites PVC floor box and leveling ring it can be installed in concrete slabs. This double screw cap cover comes with one 20A duplex outlet tamper / weather resistant receptacle, watertight gaskets, and mounting screws. The watertight gasket and corrosion- resistant hardware ensures longer product life and reliable performance. Floor boxes are a great way to modernize your home or business, increase the value, and functionality.