If there were a finishing school for bicycle pump accessories, the Lezyne Dual Valve Pump Head would be voted most likely among the student body to be compatible with Schrader, Presta, and even Dunlop valves. At the 10-year reunion, the Dual Valve's fellow alumni would see that their prediction was accurate. Its versatility is only matched by its durability, and -- if the seals should fail -- it's designed to be easily re-buildable.