Killark® SEAL-X series FXB back boxes provide control solutions in hazardous location areas to supply, START/STOP motor functions, LED pilot light Indications and more for use with Killark® factory sealed FXCS and FXS cover Assemblies. Utilized in class 1 Division 1 & 2, class 1 zone 1 & 2 areas where type 3, 7 & 9 protection ratings are required for indoor and outdoor use. The FXB is offered in single and double gang configurations from 1/2 to 1 in dead end and feed through.