Lifeline valve extensions removable vc paira pair of high quality valve extenders to fit presta valves with removable cores. Essential for inflating inner tubes mounted on deep section rims or adding additional valve clearance.lifeline valve extenders offer quick and convenient clearance to presta valves, ideal for deep section aero rims and disc wheels etc. Simply remove the valve core from your inner tube with the tool provided and thread the extender in its place. Finally, install the valve core into the top of the extender.featuresfits presta valves with removable valve coresextends the valve by 60mmsupplied with a convenient installation toolrubber o ring for an effective sealtextured top for a secure seal with the pump head when inflating at high pressuressupplied as a pairbuy lifeline bike accessories from chain reaction cycles, the world's largest online bike store.