To inflate a Presta valve, you just unscrew the valve stem anti-clockwise and afterwards attach a pump. When the desired air force has actually been attained, take away the pump and screw the valve stem clockwise to be sure it's airtight. Some pumps, for example this Silca Gravelero, aspect reversible https://letsbookmarkit.com/story19698578/a-simple-key-for-addon-prestashop-unveiled