There are two common types of tape that are referred to plumber's tape. The first should more accurately be called Teflon® tape, and the second is more correctly referred to as metal strapping. In both cases, the product is referred to as plumber's tape since it is most commonly used by plumbers.

The plumber's tape that is more properly called Teflon® tape is used to seal pipe threads against leaks. It is a thin, white tape that fills in the gaps between the pipe threads. It also acts as a lubricant for the pipe threads when tightening the fittings together. This type of plumber's tape is not an adhesive tape and cannot be used to adhere items together.

When using the Teflon® type of plumber's tape, there are some basic steps that should be followed. The plumber should start by wrapping the tape around the threads at the end of the pipe. He should not wrap tape beyond the end of the pipe, or small pieces of tape may break free and eventually clog the system. He should put a couple of loops of tape around the end of the pipe, then proceed to wrap all of the threads, overlapping half the tape's width each time.

The plumber should always wrap the tape in the same direction that he will tighten the fitting onto the pipe. If the tape is wound in the opposite direction, it will unwind when the fitting is screwed onto the pipe. The plumber's tape should be kept tight as it is wound onto the pipe so that it sinks into the threads. If the plumber changes his mind and unscrews the fitting, the tape should not be reused. Rather, the plumber's tape should be removed and a new piece used.

The other type of plumber's tape is really a type of strapping. This is a flexible metal strip with a regular series of holes running the length of the "tape." It is generally used to provide mechanical support for piping. Non-plumbers have often found much more creative uses for this product, however.

Both types of plumber's tape can be purchased from any plumbing supply store. A plumber should be sure to get the type that is required. Since the two are very different in function and look, confusion should be easily avoided.