If you're already running Stan's Universal+ valve stems and want the features of the Exo-Core system without replacing the entire valve, this kit provides the upgrade path. The Stan's NoTubes Exo-Core Valve Stem Housing Kit includes everything needed to convert a pair of Universal+ valves to full Exo-Core functionality: two alloy housings and two brass core pins that transform your existing valve bodies into the high-flow, anti-clog design that Stan's developed after twenty-five years of tubeless refinement.

The conversion takes seconds. Remove the standard Presta valve core from your Universal+ stem, drop in the Exo-Core brass core pin, and thread on the alloy housing. Once assembled, you get the same features as a complete Exo-Core valve: an oversized bore diameter that maximizes airflow during inflation and allows sealant to pass through during top-offs, external sealing that keeps dried sealant from clogging the valve mechanism, and an intuitive housing design where a quarter turn bleeds air precisely and a full turn opens the valve wide.

The housing operates on standard threading conventions, so opening and closing feels natural rather than requiring you to remember which direction does what. The tapered elliptical base that comes with your Universal+ stems already seals reliably against modern rim profiles, and the Exo-Core housing maintains compatibility with tire inserts by keeping the airflow path clear of obstruction. The self-locking valve nut stays secure through vibration and trail impacts without backing loose.... Read More