Little Firefighter 0959440 Earthquake Gas Safety Valve, Horizontal, 3/4", #AGV-75Little Firefighter Gas Safety Valve is designed to shut off the flow of natural gas to your home in the event of an earthquake. It was developed to save lives and reduce property destruction from earthquake related gas fires. The valve activates and automatically shuts off the gas supply when triggered by a 5. 4 magnitude seismic event. Each valve is UL Laboratory tested and approved and meets or exceeds the requirements of the City of Los Angeles.