The material used for the bite valves is sometimes self healing. When this happens, I simply turn the cartridge upside down (with the cap closed, of course) and squeeze the bite valve repeatedly. After about ten seconds, it opens back up.
The material used for the bite valves is sometimes self healing. When this happens, I simply turn the cartridge upside down (with the cap closed, of course) and squeeze the bite valve repeatedly. After about ten seconds, it opens back up.