Terms of the Trade: What Is a Basin Wrench?

A basin wrench against a white background.

If you do plumbing work around the house, chances are that you'll need a basin wrench at some point. The wrench is designed to reach in tight spaces behind a sink to loosen and tighten nuts or other fasteners that hold faucets to sinks. Typically, other wrenches are not capable of fitting in the tight, recessed spaces where fasteners are located.