Arlington UL Listed FLOOR BOX KITS offer installers the low cost, convenient way to put a receptacle in the floor-with a box that installs flush with the floor. We have a floor box for nearly any job site condition. There's one for new concrete pours, a box for existing floors and an adjustable box that fits most finished floor heights up to 2 in. All are available with oversized non-metallic or metal covers and all install flush with the floor surface.