Revolutionary design evolved from 20-plus years of experience with tubeless systems Engineered to work with existing pumps and gauges Oversized bore diameter ensures maximum airflow and easy sealant refresh Intuitive open/close housing design has a large grip area for precise control of airflow External sealing and an all-brass core eliminates clogs Tapered elliptical stopper ensures airtight seal on all rims Self locking valve nut has a captured o-ring to prevent loosening Tap Cap stays securely fastened and has a twist and pull design