The 081-0137-203 is a clear, non-diffused convex lens cap intended for use with the Dialight 373 series indicator base. This screw-in cap is a required component, along with a base and bulb, to create a complete indicator assembly. When fully assembled, the system is watertight and meets MIL-L-3661C requirements. The cap's clear, non-diffused properties are ideal for applications requiring direct light output in demanding environments such as aircraft cockpits, naval vessels, and ground vehicles.