TCS Max-Flow Tubeless Valves feature an insert-compatible base, increased bore diameter, an integrated valve core remover, and an ergonomically designed nut that allows riders to properly tighten down the valve without the use of a tool. TCS Max-Flow Tubeless Valves feature a castellated base for multi-directional air flow out the sides, therefore preventing the airflow restriction that can happen when a tire insert is pushed up against a traditional valve opening. Insert Compatible Allows optimal air flow with inserts. Valve Core Removal Cap No need for pliers with a valve core remover in the cap! Fluted Easy-Grip Nut Ergonomic shape allows for hand tightening. D-Ring Rubber Grommet Protects the rim from damage. Universal Presta Valve Core Easily source replacements.