SR-7JB JUNCTION BOXConnected by a short cable to the Smith Root Tote Barge cathode plate, controls electrofishing output. It also expands the electrofisher output by providing connectors for up to three Extension Cables. An 'in use or off' switch for two of the three electrode connectors allows use of 1, 2, or 3 electrodes. All active electrode pole switches and push handle must be operated simultaneously to provide electrofisher output.