Tufo Presta Valve KeyThe Tufo Valve Key is an excellent tool to have if you use Presta valve extensions or run a tubeless setup. This valve key makes replacing valve cores easier, stops over-tightening and splitting of the valve.Features: Uses: Key Cut Out Side: For Valve Extensions Key Opening: For Valve Cores Buy Tufo Wheels & Tyres from Chain Reaction Cycles, the World's Largest Online Bike Store.