Specialty plumbing wrenches are for use with specific plumbing fixtures compared to general purpose wrenches that are not designed for specific plumbing jobs. Wrenches are for use by plumbing contractors and can be used in residential plumbing applications. Adjustable valve wrenches are used to prevent marring on shower heads and other plated finishes. Internal pipe wrenches are inserted into a pipe and then turned with a common wrench so the pipe can be rotated for removal. Water shutoff wrenches are used to turn off sink, toilet and main water supply lines.