Corrosion-resistant captive stainless steel hex head bolts hold cover to body|Factory sealed enclosure confines any arcing, with no need to install external sealing fittings at each conduit entry|Dozens of possible combinations of push buttons, pilot lights and selector switches|Stainless steel pushbutton shaft operates within stainless steel bushing assuring long, maintece free operation|Pushbutton and selector switch contacts are silver cadmium oxide and are sealed in lower phenolic chamber, isolated from corrosive elements, to ensure positive contact and long, trouble free operation|Enclosed stainless steel helper spring prevents accidental operation of pushbutton in severe vibration installations|All front operated push buttons are supplied standard with lockable guard to prevent unauthorized operation|Smooth, rounded integral bushing in each hub protects conductor insulation|Clearly marked terminals with brass screws and spade terminals assure quick, easy wiring