103-1231-403 is a red neon panel mount indicator cap designed for the 103 Series with a 1" mounting hole oiltight configuration. The cap features a polycarbonate lens with a chrome plated brass bezel, providing durability and corrosion resistance in industrial environments. It is compatible with T 4 1/2 candelabra screw base neon lamps and operates at voltages of 105–125 V or 210–250 V depending on the base configuration. The indicator has a maximum dimension of 30.48 mm (1.20") in height and 22.23 mm (0.88") in width, with a 1" - 27 NS thread for secure mounting. This product is commonly used in control panels, machinery status indication, and industrial signaling applications where reliable visual feedback is required.