Moose Utility Division introduced Quick Stem Push In Valve Stems. These are designed to quickly replace torn, damaged or leaking tire stems. They also include a rubber grommet that expands when tightened to more than a third of the rim hole to prevent popping out. These stems work on any tubeless rim and are rated to 200 psi. It takes 60 second install; no need to break the bead or remove the tire to install. The stems are simple and compact and can be stored in a toolbox or tool pouch for a quick and permanent fix to flats while out on the trail. The stems are sold in pairs.
Link: Moose Utility Division