Compact Tapsplitter, this is our most economical solution for undoing or loosening stuck tap head gear on single pillar or Bib taps, ( not for mixers) save money changing the taps or calling a plumber out, if your tap is dripping, seized or you want to change the head and you cannot budge the tap head gear, this will do it for you,  with total ease without causing the usual damage. many thousands of amazed and happy customers. 4 x size hex adaptors included, 17mm. 17.5 mm 19mm and 22mm. Dont risk putting really heavy pressure using the usual tools, damage to sink or bath and pipe connections is very likely.