The new Mavic OEM UST valve kit is the same valve included with every UST Tubeless compatible rim or wheel. The valve is specially constructed to allow tire sealant to be easily injected. A mini-tool is included with the valve. This valve is compatible both for Schraeder and Presta holes sizes (8.5mm and 6.5mm) to inflate tires easily and is required to ensure an airtight seal for tubeless use. It should be removed it when using a inner tube in the tire.