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.Designed as gas pipe breakers for emergency use.Applicable in natural gas, liquid gas, manufactured gas.Ideal for low power and pressure.2. Parameter Closing modeCapacitor ...