Despite the product description "with universal double pump head for FV / AV / DV" this pump does not work on normal Dunlop valves (DV). I wonder why despite the many negative reviews this description has not yet been revised. Would have no problem if I had the Known previously, but now I have again a few days and again extra-pay shipping for a valve adapter. The pump itself acts for the price very good for me now but can not be used and why only 1 star.