The shut-off device automatically discontinues the flow of gas when the ambient temperature reaches 100 degrees C, averting fire escalation and potential gas explosions. The shut-off valve has been used throughout the world to provide automatic thermal interruption of gas in paint booth applications, water heaters, stoves and ranges, radiator and gas utilities. Although US fire codes and certifications for thermally activated shutoff devices currently do not exist, the device conforms to internationally established codes and standards. For example, the European UNI EN 1775 Standard requires all indoor gas pipelines be designed, built and protected to prevent explosions in the case of fire as well as spreading of the fire itself. It conforms to this standard as well as the European Directive 90/396/CEE, the German Firing System Directive and DVGW TRGI 86/96. It also is certified for the German National Standard DIN 3586. The industrial product line includes: G4T404 for varnishing and paint booths; TASF for gas motors; and G4TF for commercial ovens.