Continental Valve Extensions Aluminum (2pcs): BLACK 30MM

Continental:

Full control of your valve, however deep your rim profile

• Can be used on any presta tube with a screw out valve (replaceable valve core)
• Available in 20, 30, 40 & 60mm depths
• Two extensions per blister pack plus application tool
• Can be doubled up to create a longer extension 
• With this system, your original valve core is always at the top of the extension, unlike some systems which screw over the valve and leave the valve core unreachable inside the rim and require users to leave the valve open at all times.