A quiet crisis has been spreading through camping forums: hikers at remote lakes twisting brand-new canisters onto trusted stoves only to feel the threads grind, strip, or simply refuse to seat. The flame never lights, the trip sours, and someone ends up eating cold soaked meals under headlamp. Almost every time, the culprit is the same: a counterfeit or out-of-spec EN417 Valve slipped into the...