... : 4S 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 ... the right solution for old work "cut in" applications or new construction. Waterproof 4"Square Junction Box CB900