I bought this pump about two years ago, and have used it exclusively and multiple times each week since. About 3 weeks ago, I clamped it onto my rear wheel (presta) as always, and it dod not sesl. I went to the shop where I purcahsed it and they were out of replacement parts. In the meantime, I have been overinflating the tire and racing to disconnect. Lame, but effective until I can get it fixed. I would order a replacement part from Specialized site, but can't find it there; only selling pumps as far as I can tell.