Posi-fit' plug connection is a vibration proof fitting, used for those off-road conditions or to connect your Engel to your 12-24V system. Engel Portable Fridge-Freezers have a long-established reputation in Australia for their reliability, tough construction, superb performance and longevity. At the heart of Engel Fridges is the unique Sawafuji Swing Motor making Engel a legend in reliability. Over fifty years ago, Sawafuji Electric Co. Ltd Japan, purchased the drawings of a unique product, a swing motor. From its early beginnings in the 1960's this unit has evolved into a powerful and efficient cooling unit. This is the only compressor of its type in the world and is wholly owned by Sawafuji Electric Co. Ltd Japan. While many other portable fridge manufacturers procure parts from many sources all over the world Sawafuji Electric Co. Ltd alone have produced and improved this unit over many years. In this time changes made to this unique heart of the Engel portable fridge-freezers have further improved performance, reliability and power consumption.