12 Pin Trailer Plug. This plug allows for the trailer / caravan to connect to the car which has a 12 pin socket.
The beauty of the 12 pin over the 7 pin is that you can feed high amperage 12v or 24v power thru the plug for such things as battery charging, fridge or other auxiliary uses.
We have been selling this product for several years now. We try to keep a few of these on our shelves for quick delivery.