Constructional feature explosionproof and dust-ignitionproof|Factory sealed eliminates the need for adding sealing fittings and compound at each conduit entrance|Dozens of possible combinations of pushbuttons, pilot lights and selector switches|Epoxy powder coat finish for enhanced corrosion resistance|Enclosed stainless steel helper spring prevents accidental operation of pushbutton in severe vibration installations|Momentary pushbuttons are supplied with lockout type guards as standard|A hole in the guard will accept locks with up to 1/4 in hasp|Permits locking of pushbutton to prevent unauthorized operation|Large backbox for ample wiring room supplied with internal ground screw|Accurately tapped, tapered hubs for tight, rigid joints and ground continuity|Smooth rounded integral bushing in each hub protects conductor insulation|Corrosion resistant captive stainless steel hex head cap screws hold covers to body|Stainless steel pushbutton shaft operates within stainless steel bushing assuring long, maintece free operation|Push button and selector switch contacts are silver cadmium oxide which are sealed in lower phenolic chamber isolated from corrosive elements|Assures positive contact and long, trouble-free operation|Clearly marked terminals with brass screws assure quick, easy wiring|3 positions