To inflate a Presta valve, you just unscrew the valve stem anti-clockwise after which attach a pump. The moment the desired air tension has been achieved, take away the pump and screw the valve stem clockwise to make sure it's airtight. The Knowash Prestashop routine maintenance website page personalization addon https://socialmediainuk.com/story22364206/rumored-buzz-on-presta-addons