Coliter®’s Gas Safety Alarm Cut-Off System provides automatic, fail-safe protection against gas leaks in residential and commercial settings. The system integrates the AQ901 combustible gas detector with the DC301 emergency shut-off solenoid valve—triggering an audible alarm and instantly cutting off the gas supply within seconds of detecting methane, propane, or natural gas. The DC301 valve features a brass body, 24V/220V options, and manual reset, while the AQ901 offers high-sensitivity semiconductor sensing and wall-mount installation near potential leak sources (e.g., stoves, boilers). Certified to national gas safety standards, this plug-and-play system prevents fire, explosion, and poisoning risks—ideal for kitchens, boiler rooms, and rental properties requiring code-compliant gas safety.