The 161-0117-203 is a clear convex lens cap, type designation LC37CD2, designed for use with the 367 series indicator base to create a complete panel indicator assembly. This translucent cap is part of the 161 series, which provides a mechanical dimming feature that allows for partial blackout. It is designed to be watertight and mounts onto the base via a 5/16-32 NEF thread. As a component of a MIL-L-3661C compliant indicator, it is suitable for demanding applications such as tactical equipment, navigation systems, and communication devices.