169-1137-203 is a clear non-diffused stovepipe lens cap designed for the Dialight 377 Series indicator base assembly. It features a T-3 1/4 miniature bayonet mounting interface compatible with an 11/16" clearance hole (.688") panel cutout, and includes a watertight screw-on design that meets MIL-L-3661C requirements. The cap is constructed with brass housing finished in black nickel, paired with a brass mounting nut and phosphor bronze internal-tooth lockwasher in white nickel finish. This lens cap is commonly used in ground vehicles, surveillance systems, aircraft, naval vessels, and underwater applications where reliable visual indication and environmental protection are required.