Intergrips you mean?where can I get some?
Ah yes but you knew what I meantEbay or Frost UK, spell it with 2 ts if you are having trouble finding them(It's a butt weld)
There was a thread just in February:::
http://www.mig-welding.co.uk/forum/threads/i-made-a-few-of-these-today.61923/#post-779097
Stan