• 7 pin large round plug with 7 pin round socket for the trailer , caravan , boat etc
• Tough housing- it is made of waterproof quality abs materials. 
• It connects trailer and power supply well. 
• It’s widely used for a commercial vehicle, trailer, camper, car and so on. No wiring required. Just plug in. 
• This handy adapter is used to convert your existing trailer plug easily.