Honeywell BX4A3K-1A MICRO SWITCH™ Hazardous Location Switches: BX Series Hazardous Area Limit Switch, Non Plug-in, 20 mm Conduit Thread, Side Rotary Momentary, 1NC 1NO Single Pole Double Throw (SPDT), Snap Action, Double Break, 0.5 in - 14NPT Conduit, Fixed Nylon Roller Leve