Lifeline valve extensions non removable vc paira pair of high quality valve extenders to fit presta valves with non 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. Before installing, ensure that the valve core of the innertube is firmly wide open to prevent it working closed under vibration from the road.featuresfits presta valves with non removable valve coresextends the valve by 60mmtextured 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.