To inflate a Presta valve, you just unscrew the valve stem anti-clockwise after which connect a pump. After the specified air stress has been reached, clear away the pump and screw the valve stem clockwise to be sure it can be airtight. Knowband has the encounter in developing Prestashop applications https://singnalsocial.com/story4706981/the-single-best-strategy-to-use-for-presta-addons