Lew Electric RB-OBK Single, 20A receptacle round plastic floor box with flip lid, BlackLew Electric RB OBK RB OBK Product Description The Lew Electric RB OBK is an ETL listed plastic floor box, with a flip lid and round black metal cover. The unit is designed for installation in a finished wood floor. Installation is made easy through a single round cut in the floor and securing the box from above the floor with two self tightening screws that have a lip to secure the box to the bottom of the subfloor. Inside the floor box is a 20A TR