The DIALIGHT 304-1871 is a 3/4" round cap designed for illuminated pushbutton switches and matching panel mount indicators. It is part of the 183 series and is compatible with a range of caps including 184, 186, 187, 188, 302, 304, 305 & 307 series. The cap is constructed with a high-temperature scratch-resistant plastic and features a knurled flange nut for secure mounting. It's ideal for applications requiring visual indication and user feedback in industrial machinery, control panels, and other equipment. Contact Dialight for legend information.