a panel formed of a concrete material; and

a void former disposed on a section of the panel that is less than an entirety of the panel, the void former is monolithically formed in a single piece of a plastic material, the void former is removable from the panel in the single piece to leave a recess in the panel when the concrete material has reached a cured state, the void former has a body positioned within the concrete material in an uncured state of the concrete material, the body has a bottom wall, a first side wall extending from the bottom wall, a second side wall extending from the bottom wall opposite the first side wall, and a pair of end walls extending from the bottom wall and connecting the first side wall and the second side wall, the second side wall has a first side wall portion extending from the bottom wall, a second side wall portion extending from the first side wall portion to an end of the second side wall opposite the bottom wall in a height direction, and a side wall step between the first side wall portion and the second side wall portion, the side wall step positions the second side wall portion further from the first side wall than the first side wall portion, each of the end walls has an outer end wall section and a central end wall section positioned within the outer end wall section, the central end wall section is positioned further from the first side wall and the second side wall than the outer end wall section, the central end wall section has a first end wall step connecting a first end wall portion to the outer end wall section and a second end wall step connecting a second end wall portion to the first end wall portion, the second end wall portion is positioned further from the first side wall and the second side wall than the first end wall portion.