Stan’s Universal Tubeless valves offer modern features to the traditional Presta standard. Universal tubeless valves feature a black-anodized two-piece alloy base with a traditional Presta valve core. Like it’s Exo-Core tubeless valve sibling the Universal features five airflow holes four on the sides one on the bottom to ensure free flow of air and sealant even with tire inserts while a uniquely shaped rubber stopper guarantees a reliable seal on modern rim shapes.