The 128-0975-003 is a white stovepipe lens cap designed for the Dialight 367 series indicator base assembly. It features a non-diffused optical design and is compatible with the T-1 3/4 midget flange bulb base, mounting via a 5/16-32 NEF threaded interface with an O-ring seal. The lens cap is constructed to provide a watertight seal and conforms to MIL-L-3661C military specifications, with RoHS compliance (6C exemption). This component is commonly used in communication devices, navigation equipment, field medical equipment, tactical equipment, remote sensing devices, and unmanned systems (UUVs, UAVs) where reliable visual indication is required.