E-I glass-to-metal seals illustrated on pages PC-3 and PC-4 are plug-in connectors made to fit standard sockets for vibrators, choppers and lock-in types. While developed for specific use, they have found wide application for many special purpose products requiring standard plug-in seals. Note that with the exception of the lock-in plug, these connectors have no locating keys. Orientation is provided for by pin arrangement. For standard octal types. All parts are hot solder dipped to facilitate assembly.