Most of you will probably already know something about trailer hitches but for others it could be something you have no idea about so I will explain a little here. Many vehicles have the capability to tow other vehicles, such as a trailer, caravan or boat. In order to attach these items to the vehicle you require a trailer hitch, or tow-bar. There is more than one type of hitch but the most common is the ball type hitch. These are welded directly on to the vehicle and are renowned for having a ball-like rounded lump of metal on the top of them.
The ball on the hitch is removable but it is there to cover the actual workings of the receiver, parts of which are sharp, dangerous pieces of metal. Without the ball on top, these hitches could cause damage to people walking around the back of the vehicle and so it is a bad idea to remove the ball unless it is vitally necessary. The workings can also be covered with general dirt from the roads if the cover is not on and this can prevent trailers from being attached without good cleaning being done prior to it.
As mentioned previously, the ball is the most common type of hitch cover. However, it isnt the most exciting...