Mueller Electric Jack, Plugs & Sockets Jack plug 617463 - Mueller BU-P72914-0, The Mueller Electric BU-P72914-0 jack plug is a black, 4 mm laboratory connector designed for safety and reliability. It features a straight blade plug, suitable for use in electrical testing environments. This versatile jack plug is often used in laboratory and industrial applications. Mueller BU-P72914-0 Jack Plug Black Adapter 4mm Banana to 2mm Socket
