103-1335-403 is an incandescent panel mount indicator designed for 1" mounting hole applications with oiltight construction. The indicator features a white faceted transparent polycarbonate cap with chrome plated brass bezel, and a nickel plated brass base housing a candelabra screw base incandescent lamp. It operates across a voltage range of 6–250V, accommodating S-6 candelabra lamps with dual contact bayonet base options. The unit incorporates "O" rings for oiltight sealing and is mounted using 1" - 27 NS thread with a maximum bezel diameter of 25.40 mm (1.00 inch) and faceted cap height of 30.56 mm (1.20 inch). This indicator is ideal for industrial control panels, machinery status indication, and harsh environments where oil resistance and reliable visual feedback are required.