This 2 Pack of Boston Valves allows you to keep your tubes inflated if something funky happens to the original. This pack includes 2 boston valves and Schrader valve attachment.
https://player.vimeo.com/external/288959059.hd.mp4?s=25d8d14d3d82796b79a508c319e26917b7d2b190&profile_id=174