GasStop Emergency ShutoffThe GasStop protects against any gas leaks in your vehicle, by automatically shutting off the supply as soon as a major leak is detected. It also has a test function to let you check for any minor leaks, along with having a built in pressure gauge. One device multiple uses 100% emergency shut off GasStop will instantly and automatically shut off the supply of gas in the event of a major leak or regulator failure* Useful gas pressure indicator The