The 169-1191-203 is a red stovepipe lens cap for use with the Dialight 377 series indicator base. This non-diffused cap features internal fluting and a screw-on design with an 11/16-27 NS internal thread. When used with the corresponding base, it creates a watertight indicator assembly that meets MIL-L-3661C requirements. This makes it suitable for rugged applications including aircraft cockpits, naval vessels, ground vehicles, and power distribution centers.