1.Easy installation 2.auto-off valves efficient and reliable 3.Suitability 4.Fit all kinds of combustible gas Over view:New patent products, the leading price. Fit all kinds of combustible gas, fit 4 hours, 6 minutes, 1 inch different types of old and new gas pipeline valves, butterfly valves. Easy installation, no need to change the original design of gas pipeline configuration, the user can ...