This is a presta valve, if you have the right pump, you untwist the little cap on the top of it so it sits loosely and attach the pump on tightly. You’ll know if its open if you can push down the valve core after unscrewing the cap, which will cause air to flow out!
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Presta
Presta valve
This is a presta valve, if you have the right pump, you untwist the little cap on the top of it so it sits loosely and attach the pump on tightly. You’ll know if its open if you can push down the valve core after unscrewing the cap, which will cause air to flow out!