The 271-0111 is a light seal cap, designated as type LC34EN2/DO2, intended for use with the 271 series indicator base. This component features a black top color with an integrated red filter for specific visual signaling. It includes a black opaque light seal washer to ensure against light loss at the front of the panel. As part of a complete indicator assembly, this cap is suitable for applications in military vehicles, aircraft cockpits, and naval ship control panels.