valve stem replacement without removing tyre

[max]

Whilst buying 90 degree valves for the cb919 i looked at some video's on how to install them, i then found this valve stem that you can replace without removing the tire.
Never seen this before and thought it may be something small for the rider to carry with the bike for the traveler that already has everything he needs;



Valve failures are rare but there may be a place for something like this, anyway now we know it exists: quickstem;

https://www.youtube.com/watch?v=BsXUC9fyiMU