John D may be the closest? These are expensive taps, they may have this fuctionality.
The manufacturers instructions were all pictures, possibly designed so that it didn't matter where in Europe you were from. No pictures of this part at all. No written instructions.
Today asked at a large builders merchant. They had no idea. I'll have to go to the manufacturer Monday to find out its use. Meanwhile install the tap without it!
Thanks for all your help guys.
The manufacturers instructions were all pictures, possibly designed so that it didn't matter where in Europe you were from. No pictures of this part at all. No written instructions.
Today asked at a large builders merchant. They had no idea. I'll have to go to the manufacturer Monday to find out its use. Meanwhile install the tap without it!
Thanks for all your help guys.