The 2B4 is a black mounting barrier designed for use with the Series 2 modular pushbutton switch and indicator system. It is specifically engineered to attach to the long sides of a switch or indicator housing, supporting panels with a thickness from .06 to .19 inches (1.52 to 4.83 mm). The barrier utilizes spring clips to grip the panel, allowing for either individual mounting or the creation of a strip of multiple units in a single panel slot. In addition to providing a secure mounting method, the 2B4 also separates adjacent display screens to help prevent inadvertent operation.