052-3191-003 is a red neon panel mount indicator cap designed for use with 11/16" mounting hole assemblies in the 052 series. The cap features a polycarbonate construction with a 9/16 x 27 NS threaded mounting interface and includes a gasket for watertight sealing. It is compatible with T-3 1/4 miniature bayonet base neon lamps and operates at 105–125 AC-DC voltage or 110-125 AC depending on the base configuration. The indicator is commonly used in industrial control panels, instrumentation displays, and equipment status indication applications where reliable visual feedback and environmental protection are required.