I always thought it was waterworks 1 and 2 then the Gosseneck. But having a look on the Web it says tower bends is between waterworks and the Gosseneck. And thinking back I'm sure I've heard it on the commentary.
This is what iv found on the Web.
Tower Bends 25 miles Possibly originally Tar Bend or Bends, or Tower Farm Bend or Bends. Named after the Albert Tower (or Memorial) on the right which stands above the bends. Below the tower is a left-hander followed by a slight left-hander. The tower was built to commemorate the visit to Ramsey of Queen Victoria and Prince Albert on September the 20th 1847. Albert Tower is about half a mile along the track on the inside of the course from Tower Bends. Tower bends after the Albert Tower is a right-left.
If that helps?