Cheap!! Gas detector alarm system with shut off valve 1,Reputation of 3 million users, 2,30 technology ... patents 2,BV&CE Cheap!! Gas detector alarm system with shut off valve 1. FeaturesLightweight, low-cost valve for home use ... open or closed without powerClosing time less than 1 secondShut off on strong VibrationAutomatically close under strong vibrationApplicable MediaNatural Gas, GLP ...