https://www.kosoearthquakevalve.com/
Koso Earthquake Valve — Seismic Gas Shut-Off Valves
The complete line of seismic-actuated automatic gas shut-off valves for residential, commercial and industrial buildings. UL listed, DSA approved.
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https://safetvalveinc.com/
Earthquake Safety Valves - Safe-T-Valve, Incorporated
The only fail-safe, spring-loaded earthquake safety gas valve on the market; also triggered by smoke and/or carbon monoxide alarms.
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