We moved into a rental property a month ago and discovered that the hot feed tap to the washing machine is working but there is no flow to the cold feed. He will take no responsibility for it and the estate agents are as unhelpful as they possibly could be. So.... We're attempting it ourselves! We bought a wrench to try and take off the valve, as we have bought a new one but it just seems to be going round and round, without loosening or tightening at all. It has a big silver attatchment on it - could someone please help me identify what it is?