I have one customer that has everything from citizens band radios to go bags, including an earthquake emergency gas shut off valve.
A real prepper at heart.
You don’t have to live in California to be worried about the next seismic event.
These valves are relatively easy to install for the average plumber or gas piper.
HVAC companies install them on a regular basis encase you are partial to a company or tech.
Available in vertical or horizontal to fit any application.
Includes the stabilizer bracket that transmits the shock of an earthquake from the house to the valve more directly. Required in some areas and a good idea anywhere.
You could be familiar working with gas and in that case go here on Amazon and check current pricing.
Be sure to select the proper pipe size and configuration for your installation.