"The 1st one had a radiater tapping at about 10 degrees out of squre so that went back. The 2nd was fine. However the design of it makes it almost impossible to bleed properly. you have to turn it on its side or front to get all the air out. Fortunately I had plumbed mine with plastic pipe so this was possible. If it was rigidly plumbed it would have been impossible. It does look good and it works well though now I have managed to bleed it."