Reserve's patented Fillmore valve represents a game-changing leap forward in technology, with a high-flow design that eases tubeless set up and eliminates the traditional, delicate, clog-inciting valve core of yesteryear. Backed by a lifetime guarantee and supported with free shipping and returns for US customers, the Fillmore valves 3X air flow makes seating tubeless tires a snap and the Micro-Adjust feature allows you to perfectly dial in tire pressure. Sold as a pair, three lengths available: 50mm for 18 to 28mm rim depths, 70mm for 30 to 48mm rim depths, 90mm for 48 to 68mm rim depths.