Devices for sensing, measuring, indicating and controlling the pressure, flow, volume and leakage of gas, namely, gas sensors for measuring gas concentration, and gas meters; technical measuring, testing and checking apparatus and instruments for measuring, testing and checking the temperature, pressure, quantity, concentration and leakage of gas and liquids; pressure gauges; pressure indicator plugs for valves; pressure measuring apparatus; pressure measuring instruments, namely, gasometers;...

Automatic Gas Shut-Off Device AKA Excess Flow Valve