We are taking tubeless valves to the next level. Bill Shook designed the aluminum presta tubeless valves with a revolutionary fat o-ring to contour the rim surface for an air tight seal. The valve core is removable for installing sealant. The smooth inner valve surface and rounded wide base makes sealant easy to insert into the tire. Hand tighten the valve core in place. 36mm or new 46mm long, red anodized color, packed in pairs. When you see a red valve, you know it’s AC.