What is a basin tap wrench?

A basin tap wrench is a plumbing hand tool used to tighten or loosen nuts or fasteners in hard-to-reach places such as under basins, sinks and baths. 

Buy this Basin Wrench

Are basin tap wrenches known by any other names?

Basin tap wrenches come in many varieties and models such as the backnut box spanner, and the adjustable basin tap wrench. 

They are also known as: sink wrenches, tap spanners, bath spanners, and tap backnut wrenches.

No matter what you call them, they are all used to remove hard-to-reach nuts like those found under basins, sinks and baths.