ETC ECPB PB1 Surface Mount Back Box 2.5" Deep | 1-gangThe ETC ECPB PB1 is a surface mount back box designed for professional lighting control installations requiring a 1 or 2 gang enclosure format. With a 2. 5" depth, it supports surface mounted deployment where in wall box installation is not practical or desired. This back box is suited to installed environments such as theaters, performance venues, schools, and architectural lighting systems where clean, code conscious mounting hardware is needed for