A Plumbers Wrench (or plumber's wrench) is a pipe wrench used to rotate plumbing pipes. It is adjusted to different pipe diameters by rotating the key ring (silver in the picture). Its advantage is that it grips with significant force without needing to engage a nut. However, if used carelessly, it can dent or break the pipe. It can also be used on nuts and other flat engagement points. reach with a Plumbers Wrench or other types of wrenches. For example, the threaded nuts used to secure faucets to sinks are often located in deeply recessed places that can only be accessed with a basin wrench. A plumber wrench (or plumber's wrench) is a pipe wrench used to rotate plumbing pipes.