Hi, I got a couple of new Mavic Presta 60mm inner tubes and when I opened them I was quite surprised to find a small presta valve and some sort of extension. I am pretty sure I had mavic inner tubes before and they had a 60mm valve, no extension.

I attach photo. How can I attach this valve extension to the valve? I have a race on Sunday (IM70.3 St Polten) and although I hope I won't need it, it would be useful to have it ready.

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Paulo Matos