Curly Cord or "Bungy Cable" is a heavy duty and flexible connection between the tow vehicle and the caravan/trailer.
A 5 Pin plug fits the weatherproof CC type cables for car and caravan and is more secure than standard trailer plugs with a screw up locking system so there is no way that this can come undone while on the move.

The plug body is easy to hold and remove which decreases the risk of cable damage from incorrect removal by pulling on the cable which makes this a long lasting system.

These are a 5 pin plug/socket system, the CCB has receptacles and as such is termed Female while the matching socket has pins and so is the Male.