Specifically designed for the removal of stiff tap back nuts, Monument Tools'
Stiffnuts offers the advantage of a threaded sleeve screwed on to the tap tail. This eliminates lateral movement whilst a snug fitting socket will capture the back nut. Additional adaptors are available to allow swift fitting and removal of tap nuts with either a cordless drill or standard socket set extension and ratchet. 

www.monument-tools.com
From Professional Heating & Plumbing Installer March 2010