Cheers. But...I won't be buying one!   SWMBO informs me she doesn't add "blue" stuff to the cistern but sometimes bleach. She CLEANS the bowls and adds blue stuff there. I was informed of this with the hint that I moight try cleaning the loos occasionally. Amazing, I always thought a fairy did it!   So I'm thinking a tube (not 20mm conduit of course) coming up from a boss:       That pokes thru the timber and comes out thru the tile somehow where there's