Adapter for twin 12N/12S 7 pin sockets on the vehicle to an ISO 13 pin Euro connector on the caravan. A twin electric to 13 Pin electric adapter is used when you have a towbar fitted with 2x sockets (Twin Electrics) on your car, and you need to use a new style (2008 onwards) caravan that has a 13 pin power plug. This is a cheaper alternative to having the electrics on your car converted to the new 13 pin standard.