Pipe connection by the end of the pipe can be divided into: light pipe (pipe end without a thread) and the car thread tube (pipe with a thread).

Car wire tube is divided into: ordinary car thread tube and tube end thicker wire tube.

Thickening of the wire can also be divided into: thickening (with external thread), within the thickening (with internal thread) and thicker inside and outside (with internal and external thread) and other places to wire.

If the thread by the thread type can also be divided into: ordinary cylindrical or tapered thread and special thread, such as wire tube.

In addition, according to user needs, car wire tube fittings are generally equipped with delivery.