Lew Electric 812-DFB-NS Flush Mounted Round Floor Box w/Nickel Bronze CoverLew Electric 812 DFB NS 812 DFB NS Product Description The Lew Electric 812 DFB NS is a UL cUL listed cast iron floor box with round, screw plug nickel silver cover. The unit is designed for flush installation in a wood floor. Installation in carpet or tile floors is also possible with the addition of a flange (see links below). Inside the floor box is a 15A TR Duplex receptacle. The cast iron box has both 1 2 and 3 4 threaded conduit openings.