An electrical box including a flange produced utilizing a 2-shot molding process and provided as a unitary structure. The flange has a first surface and a second surface, wherein the first surface and the second surface are substantially co-planar, spaced apart, and generally parallel to a plane defined by an open end of the electrical box when the electrical box is installed into a corresponding wall structure. The flange is self-supporting and flexible to accommodate dimensional and alignment irregularities in a mounting surface. Each of a plurality of knock outs formed in the electrical box has a slit formed therein that retains passed-through cables, as well as closes and returns to an original undisturbed position when the cables are removed to maintain substantially air tight conditions.