I was told by the manufacturer that they have pulled this pump out of production and are redesigning it because the original design was defective. Evidently some pumps leak profusely as soon as you install them and others develop cracks and leaks soon after installation. Although that is a big problem, I have to say that their customer service was extremely responsive and a pleasure to deal with. I would advise waiting a month to order and making sure the vendor doesn't ship you one of the old stock.