a tool designed especially for that
A wrench with a long handle with jaws mounted on a swivel that allows the jaws to reach and handle nuts to fasten faucets to a previously installed sink.
Wrench with a long handle that allows the jaws to reach and tighten nuts to fasten faucets to an already installed sink.
This specialized plumbing tool won't come into play often. But when you need to reach nuts underneath sinks and faucets that defy access with ordinary pliers, it's worth its weight in gold. Home Improvement Encyclopedia
A long handled wrench specifically designed for working in small or awkward places.
Specialty tool used to install basin drain.