... Box, 1900 box, 1900 electrical box, 1900 junction box, conduit box, J-box, concentric box, conduit junction box, outlet box, drywall mud box, standard 1900 box, square conduit box, 4” square box, 4” square junction box, 4 ... box, vapor tight box, fire alarm box.4" Square Junction Boxes:1. 4" Square Junction boxes come in 1-1/2", 2-1/8" depths and ...