The 051-0112-203, designated as LC21GD3, is a green convex lens cap designed to complete a watertight indicator assembly when paired with a Dialight 378 Series base. This component features a 1-27 NS international thread for secure, screw-on mounting. As part of a full indicator assembly, it helps meet MIL-L-3661C requirements for robust performance. It is intended for use in demanding environments such as military ground vehicles, aircraft cockpits, naval vessels, and power distribution centers.