Muc-Off Tubeless Valve Kit: Black, fits Road and Mountain, 44mm, PairV2 Tubeless valves are stronger, lighter, and even easier to use thanks to the machined aircraft grade 7075 aluminum and Muc Offs new Tire Insert air ow system. The new design features six slots that are machined into the base of the valve stem, allows tubeless sealant uid and air to ow freely, even when running tubeless tire inserts. 7075 Machined Aluminum valve stem and cap Tire Insert air flow system keep air moving freely and compatible with most