Automatic Gas Valve Controller Shuts Off Valve When Leak Detected for Gas Safety Scentry III-SFGVC gas valve controllers include tin dioxide semi-conductor combustible gas sensors. Case of 6 explosive gas monitor s for natural gas or propane gas. Protect commercial kitchens, home gas ranges, gas heaters and more from explosions or fires. The tin dioxide semi-conductor gas sensor senses and then controls dangerous gas build-up in a building or private home the controller is a gas valve shut off that turns off the gas valve not included to the protected appliance. Note Gas valve automatically closes when the power goes off. N o option for a battery back-up. Cannot add additional remote sensors. Made in USA The Safety First USA Gas Safety Valve Controller helps avoid explosions and fires that occur when an unsafe condition occurs as the controller deactivates and shuts off a Scentry gas valve not included . Use with 1/2 inch, 3/4 inch or 1 inch Scentry gas valves. Requires a 24V transformer matched to the Scentry gas valve. Scentry III-SFGVC Safety First USA Gas Valve Controller Specifications Case ABS Plastic Physical Size 4.6 inches by 3.1 inches Weight .5 lb. Color Bone Reset manual Output Control Relays 4 amp, 24VAC Power 1.5va Sensor Type Tin Dioxide Semiconductor Connections screw terminals Propane alarm point 5200 PPM Natural Gas/Methane 12,200 PPM Use with Safety First USA UL Listed .5 inch, .75 inch or 1 inch gas valves not included . Note Requires a 24V transformer NOT INCLUDED . See installation instructions for specifications i.e. must match the transformer to power requirements of your gas valve. Made in USA. Manufacturer Safety First USA Note Replace your old CCI controls gas valve controllers with these Made in USA units. This item ships from a separate warehouse and may require extra time for delivery.