The first thing I noticed when I received this was that the hub to attach the pulley to the impeller axle was not tight enough. Comparing this to my old pump, I found that I couldn't start the pump because the hub was too far away and could mess up the belt line. I was lucky though as my old pump is in fantastic condition and I just needed a new case so I replaced my old pump with this new case and have been using it ever since. Everything seems fine and as I said the casting looks really great