This is the best pump head we have ever used. It is designed and produced by Hirame in Osaka Japan. Hirame pump adapters are hand made with care in an independent machine shop, and can handle very high pressure without popping off or leaking while you are pumping! These are highly recommended for velodromes, bmx tracks, shops, race teams, mechanics and serious home enthusiasts, too. These work the way you wish all pumps would work....and leave you wondering, why can't the major companies just include something like this on their pumps!? The lever holds onto the valve very firmly, and the clamping pressure can be adjusted instantly and easily by simply turning the knurled outer by hand. It is L shaped so can be used to pump disc wheels, carbon wheels such as hed3 etc, as well as normal spoked wheels. If you are racing at the track, are a mechanic/shop, or just an enthusiast who wants the best, you have to check this Hirame pump head out. It comes standard with the Presta/French valve adapter installed but Schrader valve adapter is included if you select that OPTION. Made in Japan. Beware of other-brand lookalikes which have been circulating recently! They do not get the good reviews that HIRAME get, and you will end up buying twice! It also comes with a 3-Pack of replacement seals for the adapter. If you choose the Schrader option, you will get an extra 3 presta seals, and 3 schrader seals. The seals do last a very long time, but we included them anyway, for peace-of-mind.